diff --git a/xep-0167.xml b/xep-0167.xml
index 5023e3c3..7466fb96 100644
--- a/xep-0167.xml
+++ b/xep-0167.xml
@@ -42,6 +42,12 @@
   &seanegan;
   &robmcqueen;
   &diana;
+  <revision>
+    <version>1.2.2</version>
+    <date>2022-09-26</date>
+    <initials>melvo</initials>
+    <remark>Specify attribute 'name' of 'mute' and 'unmute' elements as optional in schema</remark>
+  </revision>
   <revision>
     <version>1.2.1</version>
     <date>2020-09-29</date>
@@ -1933,7 +1939,7 @@ Romeo                         Juliet
         </xs:attribute>
         <xs:attribute name='name'
                       type='xs:string'
-                      use='required'/>
+                      use='optional'/>
       </xs:extension>
     </xs:simpleContent>
   </xs:complexType>