diff --git a/xep-0255.xml b/xep-0255.xml
index 6bfcc8c3..611289a2 100644
--- a/xep-0255.xml
+++ b/xep-0255.xml
@@ -43,6 +43,16 @@
     <jid>ross@buddycloud.com</jid>
 
   </author>
+  <revision>
+    <version>0.4</version>
+    <date>2009-01-06</date>
+    <initials>ht</initials>
+    <remark>
+      <ul>
+        <li>Updated schema to reflect changes made in previous revision.</li>
+      </ul>
+    </remark>
+  </revision>
   <revision>
     <version>0.3</version>
     <date>2008-12-20</date>
@@ -704,7 +714,7 @@
     <xs:complexType>
       <xs:sequence minOccurs='1' maxOccurs='1'>
         <xs:element name='timestamp' 
-                    minOccurs='1' 
+                    minOccurs='0' 
                     maxOccurs='1' 
                     type='xs:datetime'/>
         <xs:element name='publish'   
@@ -756,6 +766,10 @@
                           minOccurs='0' 
                           maxOccurs='1' 
                           type='xs:int'/>
+              <xs:element name='timestamp' 
+                          minOccurs='0' 
+                          maxOccurs='1' 
+                          type='xs:datetime'/>
             </xs:sequence>
     	  </xs:complexType>
         </xs:element>