diff --git a/xep-0030.xml b/xep-0030.xml
index b649f3c5..c14cf7e6 100644
--- a/xep-0030.xml
+++ b/xep-0030.xml
@@ -394,7 +394,7 @@
          node='http://jabber.org/protocol/commands'/>
 </iq>
       ]]></example>
-      <p>If the request included a 'node' attribute, the response SHOULD mirror the specified 'node' attribute to ensure coherence between the request and the response.</p>
+      <p>If the request included a 'node' attribute, the response MUST mirror the specified 'node' attribute to ensure coherence between the request and the response.</p>
       <example caption='JID+node result'><![CDATA[
 <iq type='result'
     from='mim.shakespeare.lit'