--- a/ttml10-sdp-us/Overview.html	Thu Sep 20 17:13:13 2012 +0800
+++ b/ttml10-sdp-us/Overview.html	Thu Sep 20 17:15:45 2012 +0800
@@ -931,9 +931,10 @@
 <section class='Core_Constraints'>
 <h4>Constraints</h4>
 <p>Processors MUST support the capability to present documents where the following constraints apply:</p>
-<p data-transform='constraint'>document MUST only specify tts:fontSize(s) using a value of 50, 75%, 100%, 150% or 200%.</p>
+<p data-transform='constraint'>document MUST only specify tts:fontSize(s) using a value of 50%, 75%, 100%, 150% or 200%.</p>
 <p>Note: Use of a fontSize of less than 75% (i.e. 50%) could result in unreadable content for a user.</p>
 <p>Note: Specifying a fontSize is used for a document could allow the user to select a preferred fontSize.</p>
+<p>Note: If a specific fontSize is unsupported, a player can snap to the next larger fontSize.</p>
 <section>
 <p data-transform='example'>Example to show how to specify an initial font.</p>
 <!-- div data-include=example3.xml'></div --></section>