diff --git a/index.html b/index.html
index 4d2772a..c70491c 100644
--- a/index.html
+++ b/index.html
@@ -91,6 +91,8 @@
         </svg>
       </div>
     </div>
+    <!-- extention slot start -->
+    <!-- extention slot end -->
     <script type="module" src="/src/main.js"></script>
   </body>
 </html>