--- a/ttml10-sdp-us/Overview.html	Wed Sep 12 14:38:10 2012 +0800
+++ b/ttml10-sdp-us/Overview.html	Thu Sep 20 17:13:13 2012 +0800
@@ -659,8 +659,8 @@
 <p>None</p>
 </section>
 </section>
-<section id='Constrained_TTML_Feature_display_display_region'>
-<h2>Use of Constrained TTML Feature <span data-transform='term'>display-region</span></h2>
+<section id='Constrained_TTML_Feature_extent_region'>
+<h2>Use of Constrained TTML Feature <span data-transform='term'>extent-region</span></h2>
 <p></p>
 <section class='Usage_Scenario'>
 <h4>Usage Scenario</h4>
@@ -673,7 +673,7 @@
 <th>Constraint</th>
 </tr>
 <tr>
-<td>#display-region</td>
+<td>#extent-region</td>
 <td>Required with constraints</td>
 <td>region<br />
 root</td>