diff --git a/proto-docs/refs.md b/proto-docs/refs.md
index 94dbc86..5947f70 100644
--- a/proto-docs/refs.md
+++ b/proto-docs/refs.md
@@ -31,7 +31,7 @@ Address of object (container id + object id)
 
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
-| ObjectID | [bytes](#bytes) |  | ObjectID is an object identifier, valid UUIDv4 represented in bytes |
+| ObjectID | [ObjectID](#refs.ObjectID) |  | ObjectID carries object identifier. |
 | CID | [bytes](#bytes) |  | CID is container identifier |
 
 
diff --git a/refs/types.proto b/refs/types.proto
index dd78dc0..45e28a5 100644
--- a/refs/types.proto
+++ b/refs/types.proto
@@ -12,8 +12,8 @@ option (gogoproto.goproto_stringer_all) = false;
 
 // Address of object (container id + object id)
 message Address {
-    // ObjectID is an object identifier, valid UUIDv4 represented in bytes
-    bytes ObjectID = 1[(gogoproto.customtype) = "ObjectID", (gogoproto.nullable) = false];
+    // ObjectID carries object identifier.
+    ObjectID ObjectID = 1;
     // CID is container identifier
     bytes CID      = 2[(gogoproto.customtype) = "CID",      (gogoproto.nullable) = false];
 }