diff --git a/xep-0166.xml b/xep-0166.xml
index a228475e..34363d18 100644
--- a/xep-0166.xml
+++ b/xep-0166.xml
@@ -1235,7 +1235,7 @@ PENDING  o-----------------------+   |
       </tr>
       <tr>
         <td>creator</td>
-        <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"). The value of the 'creator' attribute for a given content type MUST always match the party that originally generated the content type, even for Jingle actions that are sent by the other party in relation to that content type (e.g., subsequent content-modify or transport-info messages).</td>
+        <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"). The value of the 'creator' attribute for a given content type MUST always match the party that originally generated the content type, even for Jingle actions that are sent by the other party in relation to that content type (e.g., subsequent content-modify or transport-info messages). Inclusion of this attribute ensures that the value of the 'name' attribute is unique among both parties.</td>
         <td>REQUIRED</td>
       </tr>
       <tr>
@@ -1622,7 +1622,7 @@ PENDING  o-----------------------+   |
       <xs:any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>
     </xs:sequence>
     <xs:attribute name='creator'
-                  use='optional'
+                  use='required'
                   default='initiator'>
       <xs:simpleType>
         <xs:restriction base='xs:NCName'>