diff --git a/assets/templates/codemirror.html b/assets/templates/codemirror.html
index e3c681c..d11316a 100644
--- a/assets/templates/codemirror.html
+++ b/assets/templates/codemirror.html
@@ -9,6 +9,7 @@
     <script src="../static/lib/codemirror/mode/properties/properties.js"></script>
 </head>
 <body>
+<a href="https://codemirror.net/5/doc/manual.html">https://codemirror.net/5/doc/manual.html</a>
 <textarea id="code" name="code"></textarea>
 <script>
     var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
