diff --git a/source/Ox/js/HTML.js b/source/Ox/js/HTML.js
index 37354639..3435cc96 100644
--- a/source/Ox/js/HTML.js
+++ b/source/Ox/js/HTML.js
@@ -13,7 +13,7 @@
             'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'tr',
             // other
             'a', 'br', 'img', 'figure', 'figcaption',
-            //
+            // iframe
             'iframe',
             // special
             'rtl', '[]'