diff --git a/xep-0406.xml b/xep-0406.xml
index fb841bb1..f45eac3a 100644
--- a/xep-0406.xml
+++ b/xep-0406.xml
@@ -38,6 +38,12 @@
   <shortname>MIX-ADMIN</shortname>
   &ksmithisode;
   &skille;
+  <revision>
+    <version>0.3.1</version>
+    <date>2022-03-22</date>
+    <initials>gl</initials>
+    <remark>Fix reference to PubSub namespace</remark>
+  </revision>
   <revision>
     <version>0.3.0</version>
     <date>2021-03-09</date>
@@ -214,7 +220,7 @@
     id='lx09df27'
     to='mix.shakespeare.example'
     type='get'>
-     <pubsub xmlns='http://jabber.org/protocol/'>
+     <pubsub xmlns='http://jabber.org/protocol/pubsub'>
          <items node='urn:xmpp:mix:nodes:info'/>
      </pubsub>
 </iq>
@@ -223,7 +229,7 @@
     id='lx09df27'
     to='hag66@shakespeare.example/UUID-a1j/7533'
     type='result'>
-    <pubsub xmlns='http://jabber.org/protocol/'>
+    <pubsub xmlns='http://jabber.org/protocol/pubsub'>
      <items node='urn:xmpp:mix:nodes:info'>
        <item>
          <x xmlns='jabber:x:data' type='form'>