diff --git a/overviewer_core/data/web_assets/index.html b/overviewer_core/data/web_assets/index.html
index 8b25b03..1408efa 100644
--- a/overviewer_core/data/web_assets/index.html
+++ b/overviewer_core/data/web_assets/index.html
@@ -23,6 +23,11 @@
 
 <!-- Generated at: {time} -->
 <body onload="overviewer.util.initialize()">
-  <div id="mcmap"></div>
+ <div id="mcmap">
+     <div id="NoJSWarning" style="color:white; background-color:black">
+         If you can see this message, there is likely a problem loading the Overviewer javascript components.
+         Check the javascript console for error messages.
+     </div>
+ </div>
 </body>
 </html>
