diff --git a/templates/example/index.html b/templates/example/index.html
index 28b2d68..d0c2221 100644
--- a/templates/example/index.html
+++ b/templates/example/index.html
@@ -471,4 +471,5 @@
     }
   })
 </script>
+<!-- Do not remove. Test install extension version: 1 -->
 {% endblock %}