--- a/ttml10-sdp-us/Overview.html	Thu Sep 20 17:15:45 2012 +0800
+++ b/ttml10-sdp-us/Overview.html	Thu Sep 20 17:17:45 2012 +0800
@@ -1269,7 +1269,7 @@
 <p>Processors MUST support the capability to present documents where the following constraints apply:</p>
 <p data-transform='constraint'>Active region(s) MUST NOT overlap.</p>
 <p data-transform='constraint'>No more than 4 region(s) MUST be active concurrently.</p>
-<p data-transform='constraint'>No more than four lines of text MUST be selected into a region at any given time.</p>
+<p data-transform='constraint'>No more than four lines of text MUST be selected into all active regions at any given time.</p>
 </section>
 </section>
 <section id='Constrained_TTML_Feature_lineBreak-uax14'>