diff --git a/source/developers/frontend_creating_custom_ui.markdown b/source/developers/frontend_creating_custom_ui.markdown
index 7a4b8eeb41..c9da0cf1e2 100644
--- a/source/developers/frontend_creating_custom_ui.markdown
+++ b/source/developers/frontend_creating_custom_ui.markdown
@@ -48,7 +48,7 @@ frontend:
     <style>
 
     </style>
-    <textarea>[[_toStr(StateObj)]]</textarea>
+    <textarea>[[_toStr(stateObj)]]</textarea>
   </template>
 </dom-module>