diff --git a/IPython/html/static/notebook/js/toolbar.js b/IPython/html/static/notebook/js/toolbar.js
index 924368caa..5f6c1923e 100644
--- a/IPython/html/static/notebook/js/toolbar.js
+++ b/IPython/html/static/notebook/js/toolbar.js
@@ -93,7 +93,7 @@ define([
         }
     };
 
-    // Backwards compatability.
+    // Backwards compatibility.
     IPython.ToolBar = ToolBar;
 
     return {'ToolBar': ToolBar};