--- a/battery/Overview.src.html	Mon Jun 16 15:20:01 2014 +0300
+++ b/battery/Overview.src.html	Tue Jul 01 11:29:40 2014 +0300
@@ -239,7 +239,7 @@
           value positive Infinity,
         </li>
         <li>
-          level, the <code>level</code> attribute must be set to 1.0.
+          level, the <code>level</code> attribute MUST be set to 1.0.
         </li>
       </ul>
       <p>