--- a/webvtt/webvtt.html	Mon Aug 12 15:42:47 2013 +1000
+++ b/webvtt/webvtt.html	Mon Sep 16 18:00:05 2013 +1000
@@ -4478,6 +4478,9 @@
   <p>The 'box-sizing' property on the <a>WebVTT cue background box</a>
   must be set to 'border-box'.</p>
 
+  <p>The 'overflow' property on the <a>WebVTT cue background box</a> must be set
+  to 'hidden'.</pa>
+
   <p>The 'font-style' property on <a title="WebVTT Italic
   Object">WebVTT Italic Objects</a> must be set to 'italic'.</p>