diff --git a/playground/index.html b/playground/index.html
index c0c2f6ca..fa007fa2 100644
--- a/playground/index.html
+++ b/playground/index.html
@@ -761,7 +761,7 @@
           </value>
         </block>
       </category>
-      <category name="More Blocks" colour="#FF6680"></category>
+      <category name="More Blocks" colour="#FF6680" custom="PROCEDURE"></category>
     </xml>
     <!-- FPS counter -->
     <script src="../node_modules/stats.js/build/stats.min.js"></script>