diff --git a/app/views/layouts/ember_cli.html.erb b/app/views/layouts/ember_cli.html.erb
index bfc5649ecbf..b6d953e1fb7 100644
--- a/app/views/layouts/ember_cli.html.erb
+++ b/app/views/layouts/ember_cli.html.erb
@@ -18,6 +18,8 @@
     <p>Then visit the following URL to use Discourse:</p>
 
     <h3><a href="http://<%= Discourse.current_hostname %>:4200<%= Discourse.base_path %>">http://<%= Discourse.current_hostname %>:4200<%= Discourse.base_path %></a></h3>
+
+    <p>To disable this warning and allow direct Rails access, start the server with <code>ALLOW_EMBER_CLI_PROXY_BYPASS=1</code></p>
   </div>
 </body>
 </html>