diff --git a/www/code/inner.js b/www/code/inner.js
index c782c3f08..d10496993 100644
--- a/www/code/inner.js
+++ b/www/code/inner.js
@@ -54,6 +54,7 @@ define([
 
     var MEDIA_TAG_MODES = Object.freeze([
         'markdown',
+        'gfm',
         'html',
         'htmlembedded',
         'htmlmixed',