diff --git a/xep-0166.xml b/xep-0166.xml
index f33d8f83..44b93ed6 100644
--- a/xep-0166.xml
+++ b/xep-0166.xml
@@ -26,6 +26,12 @@
   &robmcqueen;
   &seanegan;
   &hildjj;
+  <revision>
+    <version>0.31</version>
+    <date>2008-09-25</date>
+    <initials>psa</initials>
+    <remark><p>Added disposition attribute to content element for mapping to SIP Content-Disposition header.</p></remark>
+  </revision>
   <revision>
     <version>0.30</version>
     <date>2008-09-23</date>
@@ -36,6 +42,7 @@
         <li>Clarified that session-accept action accepts only the content definition(s) in the session-initiate.</li>
         <li>Added optional thread element.</li>
         <li>Clarified tie breaks for transport-replace.</li>
+        <li>Modified namespaces to incorporate namespace versioning.</li>
         <li>Cleaned up XML schemas.</li>
       </ul>
     </remark>
@@ -955,6 +962,11 @@ PENDING  o----------------------+   |
         <td>Which party originally generated the content type (used to prevent race conditions regarding modifications); the defined values are "initiator" and "responder" (where the default is "initiator").</td>
         <td>REQUIRED</td>
       </tr>
+      <tr>
+        <td>disposition</td>
+        <td>How the content definition is to be interpreted by the recipient. The meaning of this attribute matches the "Content-Disposition" header as defined in &rfc2183; and applied to SIP by <cite>RFC 3261</cite>. The value of this attribute SHOULD be one of the values registered in the &ianadispositions;. The default value of this attribute is "session".</td>
+        <td>OPTIONAL</td>
+      </tr>
       <tr>
         <td>name</td>
         <td>A unique name or identifier for the content type according to the creator, which MAY have meaning to a human user in order to differentiate this content type from other content types (e.g., two content types containing video media could differentiate between "room-pan" and "slides").</td>
@@ -1220,7 +1232,9 @@ PENDING  o----------------------+   |
     <xs:sequence>
       <xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
     </xs:sequence>
-    <xs:attribute name='creator' use='required' default='initiator'>
+    <xs:attribute name='creator'
+                  use='required'
+                  default='initiator'>
       <xs:simpleType>
         <xs:restriction base='xs:NCName'>
           <xs:enumeration value='initiator'>
@@ -1228,8 +1242,16 @@ PENDING  o----------------------+   |
         </xs:restriction>
       </xs:simpleType>
     </xs:attribute>
-    <xs:attribute name='name' use='required' type='xs:string'/>
-    <xs:attribute name='senders' use='optional' default='both'>
+    <xs:attribute name='disposition'
+                  use='optional'
+                  type='xs:NCName'
+                  default='session'/>
+    <xs:attribute name='name'
+                  use='required'
+                  type='xs:string'/>
+    <xs:attribute name='senders'
+                  use='optional'
+                  default='both'>
       <xs:simpleType>
         <xs:restriction base='xs:NCName'>
           <xs:enumeration value='both'>