diff --git a/object/types.proto b/object/types.proto
index 4a11b82..3bab3b1 100644
--- a/object/types.proto
+++ b/object/types.proto
@@ -7,7 +7,6 @@ option csharp_namespace = "NeoFS.API.Object";
 
 import "refs/types.proto";
 import "service/verify.proto";
-import "storagegroup/types.proto";
 
 // Header groups the information about the NeoFS object.
 message Header {
@@ -88,8 +87,12 @@ message Header {
         // HomomorphicHash carries homomorphic hash of the object payload.
         bytes HomomorphicHash = 5;
 
-        // StorageGroup carries information about the NeoFS storage group.
-        storagegroup.StorageGroup StorageGroup = 6;
+        // StorageGroup groups meta information about a storage group.
+        message StorageGroup {
+        }
+
+        // StorageGroup marks an object containing information about a storage group.
+        StorageGroup storageGroup = 6;
 
         // Split groups information about spawning the object through a payload splitting.
         message Split {
diff --git a/proto-docs/object.md b/proto-docs/object.md
index 9dc303a..29d9955 100644
--- a/proto-docs/object.md
+++ b/proto-docs/object.md
@@ -34,6 +34,7 @@
     - [Header.Extended.Attribute](#object.Header.Extended.Attribute)
     - [Header.Extended.Integrity](#object.Header.Extended.Integrity)
     - [Header.Extended.Split](#object.Header.Extended.Split)
+    - [Header.Extended.StorageGroup](#object.Header.Extended.StorageGroup)
     - [Header.Extended.Tombstone](#object.Header.Extended.Tombstone)
     - [Header.Main](#object.Header.Main)
     - [Object](#object.Object)
@@ -386,7 +387,7 @@ the NeoFS sub-systems.
 | CreationEpoch | [uint64](#uint64) |  | CreationEpoch carries number of NeoFS epoch on which the object was created. |
 | tombstone | [Header.Extended.Tombstone](#object.Header.Extended.Tombstone) |  | Tombstone marks the object to be deleted. |
 | HomomorphicHash | [bytes](#bytes) |  | HomomorphicHash carries homomorphic hash of the object payload. |
-| StorageGroup | [storagegroup.StorageGroup](#storagegroup.StorageGroup) |  | StorageGroup carries information about the NeoFS storage group. |
+| storageGroup | [Header.Extended.StorageGroup](#object.Header.Extended.StorageGroup) |  | StorageGroup marks an object containing information about a storage group. |
 | split | [Header.Extended.Split](#object.Header.Extended.Split) |  | Split carries the position of the object in the split hierarchy. |
 
 
@@ -432,6 +433,13 @@ Split groups information about spawning the object through a payload splitting.
 | Origin | [Header](#object.Header) |  | Origin carries the header of the origin object. |
 
 
+<a name="object.Header.Extended.StorageGroup"></a>
+
+### Message Header.Extended.StorageGroup
+StorageGroup groups meta information about a storage group.
+
+
+
 <a name="object.Header.Extended.Tombstone"></a>
 
 ### Message Header.Extended.Tombstone