diff --git a/index.html b/index.html
index 768b7c2..f5b9d61 100644
--- a/index.html
+++ b/index.html
@@ -155,6 +155,7 @@ <h2>You should try it out if you like:</h2>
         
 
         <script src="https://cdnjs.cloudflare.com/ajax/libs/fastclick/1.0.6/fastclick.min.js"></script>
+        <script src="https://cdn.jsdelivr.net/gh/shentao/vuejs-outdated-docs-modal@v1.2/prompt.min.js"></script>
         <script>
             document.addEventListener('DOMContentLoaded', function() {
                 FastClick.attach(document.body);