diff --git a/IPython/frontend/html/notebook/static/js/utils.js b/IPython/frontend/html/notebook/static/js/utils.js
index 4e50ced..0a3cc86 100644
--- a/IPython/frontend/html/notebook/static/js/utils.js
+++ b/IPython/frontend/html/notebook/static/js/utils.js
@@ -257,6 +257,7 @@ IPython.utils = (function (IPython) {
                 DOWN_ARROW: 40,
                 DOWNARROW: 40,
                 DOWN     : 40,
+                COMMAND  : 91,
     };