diff --git a/frontend/index.html b/frontend/index.html
index 11a1cf7..cc93182 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -21,7 +21,7 @@
       <a href="https://docs.harelang.org/">Standard Library Reference</a>
     </span>
 
-    <div class="editor language-c"></div>
+    <div class="editor language-c">Sorry, this playground requires JavaScript. :(</div>
 
     <codapi-settings url="https://hare-exec.fly.dev/v1"></codapi-settings>
     <codapi-snippet sandbox="hare" editor="external" selector=".editor"></codapi-snippet>