--- a/spec/ttaf1-dfxp.xml	Thu Aug 26 19:48:41 2010 +0000
+++ b/spec/ttaf1-dfxp.xml	Thu Aug 26 21:19:18 2010 +0000
@@ -8696,7 +8696,27 @@
 <gitem>
 <label>Additional information:</label>
 <def>
-<p>None.</p>
+<glist>
+<gitem>
+    <label>Magic number(s):</label>
+    <def></def>
+</gitem>
+<gitem>
+    <label>File extension(s):</label>
+    <def><p>ttml</p></def>
+</gitem>
+<gitem>
+    <label>Macintosh file type code(s):</label>
+    <def><p>"TTML"</p></def>
+</gitem>
+<gitem>
+<label>Macintosh Universal Type Identifier code:</label>
+<def><p>org.w3c.ttml conforms to public.xml</p></def>
+</gitem>
+<gitem>
+<label>Windows Clipboard Name:</label>
+<def><p>"Timed Text Document"</p></def>
+</glist>
 </def>
 </gitem>
 <gitem>