diff --git a/client/aqua/user-list.aqua b/client/aqua/user-list.aqua
index 375aa13..0414c9c 100644
--- a/client/aqua/user-list.aqua
+++ b/client/aqua/user-list.aqua
@@ -20,5 +20,5 @@ service UserList:
     is_authenticated: -> AuthResult
     get_users: -> GetUsersServiceResult
     join: User -> EmptyServiceResult
-    leave(userPeerId: PeerID) -> EmptyServiceResult
-    is_exists(userPeerId: PeerID)
+    leave: string -> EmptyServiceResult -- user peerId
+    is_exists: string -> () -- user peerId