diff --git a/xep-0294.xml b/xep-0294.xml
index c527d533..ef14079a 100644
--- a/xep-0294.xml
+++ b/xep-0294.xml
@@ -33,6 +33,12 @@
     <email>olivier.crete@collabora.co.uk</email>
     <jid>olivier.crete@collabora.co.uk</jid>
   </author>
+  <revision>
+    <version>1.1.1</version>
+    <date>2021-10-23</date>
+    <initials>egp</initials>
+    <remark><p>Strenghten the restriction on the 'id' attribute in the schema by making it xs:unsignedShort.</p></remark>
+  </revision>
   <revision>
     <version>1.1</version>
     <date>2021-03-28</date>
@@ -311,7 +317,7 @@ a=extmap-allow-mixed
             minOccurs='0'
             maxOccurs='unbounded'/>
       </xs:sequence>
-      <xs:attribute name='id' type='xs:unsignedInt' use='required'/>
+      <xs:attribute name='id' type='xs:unsignedShort' use='required'/>
       <xs:attribute name='uri' type='xs:string' use='required'/>
       <xs:attribute name='senders'
                   use='optional'