diff --git a/acl/types.proto b/acl/types.proto
index e48f7d9..fa55427 100644
--- a/acl/types.proto
+++ b/acl/types.proto
@@ -176,7 +176,8 @@ message EACLRecord {
     // Target subject's role class
     Role role = 1 [json_name="role"];
 
-    // List of public keys to identify target subject
+    // List of 25-byte accounts to identify target subjects.
+    // 33-byte public keys are also supported, however, they are deprecated and script hashes should be derived from them.
     repeated bytes keys = 2 [json_name="keys"];
   }
   // List of target subjects to apply ACL rule to
diff --git a/proto-docs/acl.md b/proto-docs/acl.md
index 9563f3e..d434801 100644
--- a/proto-docs/acl.md
+++ b/proto-docs/acl.md
@@ -152,7 +152,7 @@ keys to match.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | role | [Role](#neo.fs.v2.acl.Role) |  | Target subject's role class |
-| keys | [bytes](#bytes) | repeated | List of public keys to identify target subject |
+| keys | [bytes](#bytes) | repeated | List of 25-byte accounts to identify target subjects. 33-byte public keys are also supported, however, they are deprecated and script hashes should be derived from them. |
 
 
 <a name="neo.fs.v2.acl.EACLTable"></a>