--- a/ttml-ww-profiles/ttml-ww-profiles.html	Sat May 02 11:25:34 2015 -0700
+++ b/ttml-ww-profiles/ttml-ww-profiles.html	Sat May 02 11:39:27 2015 -0700
@@ -1358,9 +1358,7 @@
           <tr>
             <td><code>#timeBase-media</code></td>
 
-            <td><em class="rfc2119" title="SHALL">SHALL</em> be used, with the following additional constraints:<ul><li>
-						<code>ttp:timeBase</code> <em class="rfc2119" title="SHALL">SHALL</em> be present on the <code>tt</code> element and <em class="rfc2119" title="SHALL">SHALL</em> be equal to
-            "media".</li></ul></td>
+            <td><em class="rfc2119" title="SHALL">SHALL</em> be used. NOTE: [<cite><a class="bibref" href="#bib-TTML1">TTML1</a></cite>] specifies that the default timebase is <code>"media"</code> if <code>ttp:timeBase</code> is not specified on <code>tt</code>.</td>
           </tr>
 
           <tr>
@@ -1412,7 +1410,7 @@
 						
 						<ul><li>all time expressions within a <a href="#dfn-document-instance" class="internalDFN">Document Instance</a> <em class="rfc2119" title="SHOULD">SHOULD</em> use the same syntax, either <code>clock-time</code> or <code>offset-time</code>; and</li>
 						
-						<li>for any content element that contains <code>br</code> elements or text nodes or a <code>smpte:backgroundImage</code> attribute, the <code>begin</code> and  <code>end</code> attributes <em class="rfc2119" title="SHOULD">SHOULD</em> be specified on the content element or at least one of its ancestors.</li></ul>
+						<li>for any content element that contains <code>br</code> elements or text nodes or a <code>smpte:backgroundImage</code> attribute, the <code>begin</code> and <code>end</code> attributes <em class="rfc2119" title="SHOULD">SHOULD</em> be specified on the content element or at least one of its ancestors.</li></ul>
 						</td>
           </tr>
 

--- a/ttml-ww-profiles/ttml-ww-profiles.source.html	Sat May 02 11:25:34 2015 -0700
+++ b/ttml-ww-profiles/ttml-ww-profiles.source.html	Sat May 02 11:39:27 2015 -0700
@@ -1048,9 +1048,7 @@
           <tr>
             <td><code>#timeBase-media</code></td>
 
-            <td>SHALL be used, with the following additional constraints:<ul><li>
-						<code>ttp:timeBase</code> SHALL be present on the <code>tt</code> element and SHALL be equal to
-            "media".</li></ul></td>
+            <td>SHALL be used. NOTE: [[TTML1]] specifies that the default timebase is <code>"media"</code> if <code>ttp:timeBase</code> is not specified on <code>tt</code>.</td>
           </tr>
 
           <tr>