diff --git a/www/code/inner.html b/www/code/inner.html
index 106430ec0..9efa89e4b 100644
--- a/www/code/inner.html
+++ b/www/code/inner.html
@@ -11,6 +11,7 @@
     <script src="codemirror-5.16.0/mode/loadmode.js"></script>
     <script src="codemirror-5.16.0/mode/meta.js"></script>
     <script src="codemirror-5.16.0/addon/mode/overlay.js"></script>
+    <script src="codemirror-5.16.0/addon/mode/multiplex.js"></script>
     <script src="codemirror-5.16.0/addon/edit/closebrackets.js"></script>
     <script src="codemirror-5.16.0/addon/edit/matchbrackets.js"></script>
     <script src="codemirror-5.16.0/addon/edit/trailingspace.js"></script>