diff --git a/container/service.proto b/container/service.proto
index 0749926..fae6d4c 100644
--- a/container/service.proto
+++ b/container/service.proto
@@ -21,8 +21,8 @@ service ContainerService {
   // is added into smart contract storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // request to save the container has been sent to the sidechain;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   request to save the container has been sent to the sidechain;
   // - Common failures (SECTION_FAILURE_COMMON).
   rpc Put(PutRequest) returns (PutResponse);
 
@@ -32,26 +32,26 @@ service ContainerService {
   // is added into smart contract storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // request to remove the container has been sent to the sidechain;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   request to remove the container has been sent to the sidechain;
   // - Common failures (SECTION_FAILURE_COMMON).
   rpc Delete(DeleteRequest) returns (DeleteResponse);
 
   // Returns container structure from `Container` smart contract storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // container has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   container has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // requested container not found.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   requested container not found.
   rpc Get(GetRequest) returns (GetResponse);
 
   // Returns all owner's containers from 'Container` smart contract' storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // container list has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   container list has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON).
   rpc List(ListRequest) returns (ListResponse);
 
@@ -60,8 +60,8 @@ service ContainerService {
   // added into smart contract storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // request to save container eACL has been sent to the sidechain;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   request to save container eACL has been sent to the sidechain;
   // - Common failures (SECTION_FAILURE_COMMON).
   rpc SetExtendedACL(SetExtendedACLRequest) returns (SetExtendedACLResponse);
 
@@ -69,18 +69,18 @@ service ContainerService {
   // storage.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // container eACL has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   container eACL has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // container not found.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   container not found.
   rpc GetExtendedACL(GetExtendedACLRequest) returns (GetExtendedACLResponse);
 
   // Announce container used space values for P2P synchronization.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // estimation of used space has been successfully announced;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   estimation of used space has been successfully announced;
   // - Common failures (SECTION_FAILURE_COMMON).
   rpc AnnounceUsedSpace(AnnounceUsedSpaceRequest) returns (AnnounceUsedSpaceResponse);
 }
diff --git a/object/service.proto b/object/service.proto
index 061050f..4170e1d 100644
--- a/object/service.proto
+++ b/object/service.proto
@@ -20,19 +20,19 @@ service ObjectService {
   // keeping receiving order.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // object has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   object has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // read access to the object is denied;
-  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
-  // object not found in container;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired;
-  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
-  // the requested object has been marked as deleted.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   read access to the object is denied;
+  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  //   object not found in container;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  //   the requested object has been marked as deleted.
   rpc Get(GetRequest) returns (stream GetResponse);
 
   // Put the object into container. Request uses gRPC stream. First message
@@ -43,41 +43,41 @@ service ObjectService {
   // Chunk messages SHOULD be sent in direct order of fragmentation.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // object has been successfully saved in the container;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   object has been successfully saved in the container;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **LOCKED** (2050, SECTION_OBJECT):
-  // placement of an object of type TOMBSTONE that includes at least one locked
-  // object is prohibited;
-  // - **LOCK_NON_REGULAR_OBJECT** (2051, SECTION_OBJECT):
-  // placement of an object of type LOCK that includes at least one object of
-  // type other than REGULAR is prohibited;
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object storage container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // write access to the container is denied;
-  // - **TOKEN_NOT_FOUND** (4096, SECTION_SESSION):
-  // (for trusted object preparation) session private key does not exist or has
+  // - **LOCKED** (2050, SECTION_OBJECT): \
+  //   placement of an object of type TOMBSTONE that includes at least one locked
+  //   object is prohibited;
+  // - **LOCK_NON_REGULAR_OBJECT** (2051, SECTION_OBJECT): \
+  //   placement of an object of type LOCK that includes at least one object of
+  //   type other than REGULAR is prohibited;
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object storage container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   write access to the container is denied;
+  // - **TOKEN_NOT_FOUND** (4096, SECTION_SESSION): \
+  //   (for trusted object preparation) session private key does not exist or has
   // been deleted;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired.
   rpc Put(stream PutRequest) returns (PutResponse);
 
   // Delete the object from a container. There is no immediate removal
   // guarantee. Object will be marked for removal and deleted eventually.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // object has been successfully marked to be removed from the container;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   object has been successfully marked to be removed from the container;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **LOCKED** (2050, SECTION_OBJECT):
-  // deleting a locked object is prohibited;
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // delete access to the object is denied;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // - **LOCKED** (2050, SECTION_OBJECT): \
+  //   deleting a locked object is prohibited;
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   delete access to the object is denied;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired.
   rpc Delete(DeleteRequest) returns (DeleteResponse);
 
   // Returns the object Headers without data payload. By default full header is
@@ -85,19 +85,19 @@ service ObjectService {
   // the very minimal information would be returned instead.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // object header has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   object header has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // access to operation HEAD of the object is denied;
-  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
-  // object not found in container;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired;
-  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
-  // the requested object has been marked as deleted.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   access to operation HEAD of the object is denied;
+  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  //   object not found in container;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  //   the requested object has been marked as deleted.
   rpc Head(HeadRequest) returns (HeadResponse);
 
   // Search objects in container. Search query allows to match by Object
@@ -105,15 +105,15 @@ service ObjectService {
   // Specification section for more details.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // objects have been successfully selected;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   objects have been successfully selected;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // search container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // access to operation SEARCH of the object is denied;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   search container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   access to operation SEARCH of the object is denied;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired.
   rpc Search(SearchRequest) returns (stream SearchResponse);
 
   // Get byte range of data payload. Range is set as an (offset, length) tuple.
@@ -122,19 +122,19 @@ service ObjectService {
   // order.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // data range of the object payload has been successfully read;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   data range of the object payload has been successfully read;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // access to operation RANGE of the object is denied;
-  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
-  // object not found in container;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired;
-  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
-  // the requested object has been marked as deleted.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   access to operation RANGE of the object is denied;
+  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  //   object not found in container;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  //   the requested object has been marked as deleted.
   rpc GetRange(GetRangeRequest) returns (stream GetRangeResponse);
 
   // Returns homomorphic or regular hash of object's payload range after
@@ -143,17 +143,17 @@ service ObjectService {
   // request. Note that hash is calculated for XORed data.
   //
   // Statuses:
-  // - **OK** (0, SECTION_SUCCESS):
-  // data range of the object payload has been successfully hashed;
+  // - **OK** (0, SECTION_SUCCESS): \
+  //   data range of the object payload has been successfully hashed;
   // - Common failures (SECTION_FAILURE_COMMON);
-  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER):
-  // object container not found;
-  // - **ACCESS_DENIED** (2048, SECTION_OBJECT):
-  // access to operation RANGEHASH of the object is denied;
-  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
-  // object not found in container;
-  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  //   object container not found;
+  // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  //   access to operation RANGEHASH of the object is denied;
+  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  //   object not found in container;
+  // - **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  //   provided session token has expired.
   rpc GetRangeHash(GetRangeHashRequest) returns (GetRangeHashResponse);
 }
 
diff --git a/proto-docs/container.md b/proto-docs/container.md
index 13bd4db..80684db 100644
--- a/proto-docs/container.md
+++ b/proto-docs/container.md
@@ -85,8 +85,8 @@ verified by Inner Ring nodes. After one more block in sidechain, container
 is added into smart contract storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-request to save the container has been sent to the sidechain;
+- **OK** (0, SECTION_SUCCESS): \
+  request to save the container has been sent to the sidechain;
 - Common failures (SECTION_FAILURE_COMMON).
 
 | Name | Input | Output |
@@ -100,8 +100,8 @@ verified by Inner Ring nodes. After one more block in sidechain, container
 is added into smart contract storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-request to remove the container has been sent to the sidechain;
+- **OK** (0, SECTION_SUCCESS): \
+  request to remove the container has been sent to the sidechain;
 - Common failures (SECTION_FAILURE_COMMON).
 
 | Name | Input | Output |
@@ -112,9 +112,11 @@ request to remove the container has been sent to the sidechain;
 Returns container structure from `Container` smart contract storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-container has been successfully read;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  container has been successfully read;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  requested container not found.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -124,8 +126,8 @@ container has been successfully read;
 Returns all owner's containers from 'Container` smart contract' storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-container list has been successfully read;
+- **OK** (0, SECTION_SUCCESS): \
+  container list has been successfully read;
 - Common failures (SECTION_FAILURE_COMMON).
 
 | Name | Input | Output |
@@ -138,8 +140,8 @@ immediately. After one more block in sidechain, Extended ACL changes are
 added into smart contract storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-request to save container eACL has been sent to the sidechain;
+- **OK** (0, SECTION_SUCCESS): \
+  request to save container eACL has been sent to the sidechain;
 - Common failures (SECTION_FAILURE_COMMON).
 
 | Name | Input | Output |
@@ -151,9 +153,11 @@ Returns Extended ACL table and signature from `Container` smart contract
 storage.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-container eACL has been successfully read;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  container eACL has been successfully read;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  container not found.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -163,8 +167,8 @@ container eACL has been successfully read;
 Announce container used space values for P2P synchronization.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-estimation of used space has been successfully announced;
+- **OK** (0, SECTION_SUCCESS): \
+  estimation of used space has been successfully announced;
 - Common failures (SECTION_FAILURE_COMMON).
 
 | Name | Input | Output |
diff --git a/proto-docs/lock.md b/proto-docs/lock.md
new file mode 100644
index 0000000..b23c734
--- /dev/null
+++ b/proto-docs/lock.md
@@ -0,0 +1,62 @@
+# Protocol Documentation
+<a name="top"></a>
+
+## Table of Contents
+
+- [lock/types.proto](#lock/types.proto)
+
+  - Messages
+    - [Lock](#neo.fs.v2.lock.Lock)
+    
+
+- [Scalar Value Types](#scalar-value-types)
+
+
+
+<a name="lock/types.proto"></a>
+<p align="right"><a href="#top">Top</a></p>
+
+## lock/types.proto
+
+
+ <!-- end services -->
+
+
+<a name="neo.fs.v2.lock.Lock"></a>
+
+### Message Lock
+Lock objects protects a list of objects from being deleted. Lifetime of the
+lock object is limited similar to regular objects in
+`__NEOFS__EXPIRATION_EPOCH` attribute.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| members | [neo.fs.v2.refs.ObjectID](#neo.fs.v2.refs.ObjectID) | repeated | List of objects to lock. Must not be empty or carry empty IDs. All members must be of the `REGULAR` type. |
+
+ <!-- end messages -->
+
+ <!-- end enums -->
+
+
+
+## Scalar Value Types
+
+| .proto Type | Notes | C++ Type | Java Type | Python Type |
+| ----------- | ----- | -------- | --------- | ----------- |
+| <a name="double" /> double |  | double | double | float |
+| <a name="float" /> float |  | float | float | float |
+| <a name="int32" /> int32 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead. | int32 | int | int |
+| <a name="int64" /> int64 | Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead. | int64 | long | int/long |
+| <a name="uint32" /> uint32 | Uses variable-length encoding. | uint32 | int | int/long |
+| <a name="uint64" /> uint64 | Uses variable-length encoding. | uint64 | long | int/long |
+| <a name="sint32" /> sint32 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. | int32 | int | int |
+| <a name="sint64" /> sint64 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. | int64 | long | int/long |
+| <a name="fixed32" /> fixed32 | Always four bytes. More efficient than uint32 if values are often greater than 2^28. | uint32 | int | int |
+| <a name="fixed64" /> fixed64 | Always eight bytes. More efficient than uint64 if values are often greater than 2^56. | uint64 | long | int/long |
+| <a name="sfixed32" /> sfixed32 | Always four bytes. | int32 | int | int |
+| <a name="sfixed64" /> sfixed64 | Always eight bytes. | int64 | long | int/long |
+| <a name="bool" /> bool |  | bool | boolean | boolean |
+| <a name="string" /> string | A string must always contain UTF-8 encoded or 7-bit ASCII text. | string | String | str/unicode |
+| <a name="bytes" /> bytes | May contain any arbitrary sequence of bytes. | string | ByteString | str |
+
diff --git a/proto-docs/object.md b/proto-docs/object.md
index fa33d43..a483e8c 100644
--- a/proto-docs/object.md
+++ b/proto-docs/object.md
@@ -93,9 +93,19 @@ be restored by concatenation of object message payload and all chunks
 keeping receiving order.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-object has been successfully read;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  object has been successfully read;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  read access to the object is denied;
+- **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  object not found in container;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired;
+- **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  the requested object has been marked as deleted.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -110,9 +120,24 @@ object payload. All messages, except first one, SHOULD be payload chunks.
 Chunk messages SHOULD be sent in direct order of fragmentation.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-object has been successfully saved in the container;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  object has been successfully saved in the container;
+- Common failures (SECTION_FAILURE_COMMON);
+- **LOCKED** (2050, SECTION_OBJECT): \
+  placement of an object of type TOMBSTONE that includes at least one locked
+  object is prohibited;
+- **LOCK_NON_REGULAR_OBJECT** (2051, SECTION_OBJECT): \
+  placement of an object of type LOCK that includes at least one object of
+  type other than REGULAR is prohibited;
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object storage container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  write access to the container is denied;
+- **TOKEN_NOT_FOUND** (4096, SECTION_SESSION): \
+  (for trusted object preparation) session private key does not exist or has
+been deleted;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -123,9 +148,17 @@ Delete the object from a container. There is no immediate removal
 guarantee. Object will be marked for removal and deleted eventually.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-object has been successfully marked to be removed from the container;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  object has been successfully marked to be removed from the container;
+- Common failures (SECTION_FAILURE_COMMON);
+- **LOCKED** (2050, SECTION_OBJECT): \
+  deleting a locked object is prohibited;
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  delete access to the object is denied;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -137,9 +170,19 @@ returned. If `main_only` request field is set, the short header with only
 the very minimal information would be returned instead.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-object header has been successfully read;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  object header has been successfully read;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  access to operation HEAD of the object is denied;
+- **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  object not found in container;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired;
+- **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  the requested object has been marked as deleted.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -151,9 +194,15 @@ Header's filed values. Please see the corresponding NeoFS Technical
 Specification section for more details.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-objects have been successfully selected;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  objects have been successfully selected;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  search container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  access to operation SEARCH of the object is denied;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -166,9 +215,19 @@ restored by concatenation of all received payload chunks keeping receiving
 order.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-data range of the object payload has been successfully read;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  data range of the object payload has been successfully read;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  access to operation RANGE of the object is denied;
+- **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  object not found in container;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired;
+- **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT): \
+  the requested object has been marked as deleted.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -181,9 +240,17 @@ length) tuples. Hashes order in response corresponds to ranges order in
 request. Note that hash is calculated for XORed data.
 
 Statuses:
-- **OK** (0, SECTION_SUCCESS):
-data range of the object payload has been successfully hashed;
-- Common failures (SECTION_FAILURE_COMMON).
+- **OK** (0, SECTION_SUCCESS): \
+  data range of the object payload has been successfully hashed;
+- Common failures (SECTION_FAILURE_COMMON);
+- **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \
+  object container not found;
+- **ACCESS_DENIED** (2048, SECTION_OBJECT): \
+  access to operation RANGEHASH of the object is denied;
+- **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  object not found in container;
+- **TOKEN_EXPIRED** (4097, SECTION_SESSION): \
+  provided session token has expired.
 
 | Name | Input | Output |
 | ---- | ----- | ------ |
@@ -780,6 +847,9 @@ Object structure. Object is immutable and content-addressed. It means
 `ObjectID` will change if header or payload changes. It's calculated as a
 hash of header field, which contains hash of object's payload.
 
+For non-regular object types payload format depends on object type specified
+in the header.
+
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
@@ -843,19 +913,21 @@ Type of match expression
 
 ### ObjectType
 Type of the object payload content. Only `REGULAR` type objects can be split,
-hence `TOMBSTONE` and `STORAGE_GROUP` payload is limited by maximal object
-size.
+hence `TOMBSTONE`, `STORAGE_GROUP` and `LOCK` payload is limited by maximal
+object size.
 
 String presentation of object type is the same as definition:
 * REGULAR
 * TOMBSTONE
 * STORAGE_GROUP
+* LOCK
 
 | Name | Number | Description |
 | ---- | ------ | ----------- |
 | REGULAR | 0 | Just a normal object |
 | TOMBSTONE | 1 | Used internally to identify deleted objects |
 | STORAGE_GROUP | 2 | StorageGroup information |
+| LOCK | 3 | Object lock |
 
 
  <!-- end enums -->
diff --git a/proto-docs/status.md b/proto-docs/status.md
index de1b44b..ea97ac7 100644
--- a/proto-docs/status.md
+++ b/proto-docs/status.md
@@ -109,8 +109,11 @@ Section of statuses for object-related operations.
 
 | Name | Number | Description |
 | ---- | ------ | ----------- |
-| ACCESS_DENIED | 0 | [**2048**] Access denied by ACL. Details: - [**0**] Human-readable description. |
+| ACCESS_DENIED | 0 | [**2048**] Access denied by ACL. Details: - [**0**] Human-readable description (UTF-8 encoded string). |
 | OBJECT_NOT_FOUND | 1 | [**2049**] Object not found. |
+| LOCKED | 2 | [**2050**] Operation rejected by the object lock. |
+| LOCK_NON_REGULAR_OBJECT | 3 | [**2051**] Locking an object with a non-REGULAR type rejected. |
+| OBJECT_ALREADY_REMOVED | 4 | [**2052**] Object has been marked deleted. |