diff --git a/UPGRADE-4.1.md b/UPGRADE-4.1.md
index 64921efd28..d6202c682f 100644
--- a/UPGRADE-4.1.md
+++ b/UPGRADE-4.1.md
@@ -64,6 +64,9 @@ Form
    }
    ```
 
+ * Added `help` option to the form field. If you have custom Form extension for it, you should remove it. 
+   Also remove it from the custom form theme.  
+
 FrameworkBundle
 ---------------