diff --git a/source/_components/frontend.markdown b/source/_components/frontend.markdown
index 40274f80623..aa7f0cb9263 100644
--- a/source/_components/frontend.markdown
+++ b/source/_components/frontend.markdown
@@ -39,7 +39,11 @@ frontend:
             required: true
             type: [list, string]
   extra_html_url:
-    description: "List of addtional [resources](/developers/frontend_creating_custom_ui/) to load."
+    description: "List of addtional [resources](/developers/frontend_creating_custom_ui/) to load in `latest` javascript mode."
+    required: false
+    type: list
+  extra_html_url_es5:
+    description: "List of addtional [resources](/developers/frontend_creating_custom_ui/) to load in `es5` javascript mode."
     required: false
     type: list
   development_repo: