diff --git a/xep-0215.xml b/xep-0215.xml
index 30666393..86f25659 100644
--- a/xep-0215.xml
+++ b/xep-0215.xml
@@ -314,7 +314,7 @@
   <section2 topic='Protocol Namespaces' anchor='registrar-ns'>
     <p>This specification defines the following XML namespace:</p>
     <ul>
-      <li>urn:xmpp:extdisco:1</li>
+      <li>urn:xmpp:extdisco:0</li>
     </ul>
     <p>Upon advancement of this specification from a status of Experimental to a status of Draft, the &REGISTRAR; shall add the foregoing namespace to the registry located at &NAMESPACES;, as described in Section 4 of &xep0053;.</p>
   </section2>