diff --git a/application/index/view/index/index.html b/application/index/view/index/index.html
index fa215e6..aff690f 100644
--- a/application/index/view/index/index.html
+++ b/application/index/view/index/index.html
@@ -30,6 +30,7 @@
   <script src="//cdn.bootcss.com/codemirror/5.30.0/addon/lint/javascript-lint.js"></script>
   <script src="//cdn.bootcss.com/codemirror/5.30.0/addon/hint/javascript-hint.js"></script>
 
+  <script src="//cdn.bootcss.com/codemirror/5.30.0/addon/fold/foldcode.js"></script>
   <link href="//cdn.bootcss.com/codemirror/5.30.0/addon/fold/foldgutter.css" rel="stylesheet">
   <script src="//cdn.bootcss.com/codemirror/5.30.0/addon/fold/foldgutter.js"></script>