diff --git a/object/types.proto b/object/types.proto
index bdbf17e..0a5c688 100644
--- a/object/types.proto
+++ b/object/types.proto
@@ -12,12 +12,13 @@ message Header {
     // System groups mandatory information about the object.
     // Message fields are presented in all NeoFS objects.
     message System {
-        // PayloadLength is an object payload length
+        // PayloadLength carries length of the object payload.
+        // Each object has a fixed payload length since it's immutable.
         uint64 PayloadLength = 1;
         // Address carries object address in the NeoFS system.
         // It encapsulates the object and the container identifiers.
         refs.Address Address = 2;
-        // OwnerID is a wallet address
+        // OwnerID carries identifier the object owner in a binary format.
         bytes OwnerID = 3;
     }
     // System carries the main part of the header.
@@ -102,9 +103,11 @@ message Header {
     Extended extended = 2;
 }
 
+// Object groups the information about the NeoFS object.
+// It consists of payload data with additional service information.
 message Object {
     // Header carries the object header.
     Header Header = 1;
-    // Payload is an object's payload
+    // Payload carries the object payload bytes.
     bytes Payload = 2;
 }
diff --git a/proto-docs/object.md b/proto-docs/object.md
index 59d8548..864d852 100644
--- a/proto-docs/object.md
+++ b/proto-docs/object.md
@@ -448,21 +448,22 @@ Message fields are presented in all NeoFS objects.
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
-| PayloadLength | [uint64](#uint64) |  | PayloadLength is an object payload length |
+| PayloadLength | [uint64](#uint64) |  | PayloadLength carries length of the object payload. Each object has a fixed payload length since it's immutable. |
 | Address | [refs.Address](#refs.Address) |  | Address carries object address in the NeoFS system. It encapsulates the object and the container identifiers. |
-| OwnerID | [bytes](#bytes) |  | OwnerID is a wallet address |
+| OwnerID | [bytes](#bytes) |  | OwnerID carries identifier the object owner in a binary format. |
 
 
 <a name="object.Object"></a>
 
 ### Message Object
-
+Object groups the information about the NeoFS object.
+It consists of payload data with additional service information.
 
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | Header | [Header](#object.Header) |  | Header carries the object header. |
-| Payload | [bytes](#bytes) |  | Payload is an object's payload |
+| Payload | [bytes](#bytes) |  | Payload carries the object payload bytes. |
 
  <!-- end messages -->