diff --git a/ChangeLog b/ChangeLog
index 825c7a4..275600e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@ DATE  Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
     * New parsers/serialisers:
         - Client State Indication (XEP-0352)
         - OpenPGP for XMPP (XEP-0373)
+        - Anonymous unique occupant identifiers for MUCs (XEP-0421)
     * Breaking changes:
         - Presence constructors now take Into<Jid> and assume Some.
 
diff --git a/doap.xml b/doap.xml
index 713ca9f..6b8bf5a 100644
--- a/doap.xml
+++ b/doap.xml
@@ -440,6 +440,14 @@
             <xmpp:since>0.1.0</xmpp:since>
         </xmpp:SupportedXep>
     </implements>
+    <implements>
+        <xmpp:SupportedXep>
+            <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0421.html"/>
+            <xmpp:status>complete</xmpp:status>
+            <xmpp:version>0.1.0</xmpp:version>
+            <xmpp:since>NEXT</xmpp:since>
+        </xmpp:SupportedXep>
+    </implements>
 
     <release>
         <Version>