diff --git a/interface/weakref.h b/interface/weakref.h
index 903de9a876..03a9663130 100644
--- a/interface/weakref.h
+++ b/interface/weakref.h
@@ -112,7 +112,8 @@ public:
 
     /**
         Called when the tracked object is destroyed. Be default sets
-        internal pointer to @NULL.
+        internal pointer to @NULL. You need to call this method if
+        you override it.
     */
     virtual void OnObjectDestroy();