diff --git a/ejabberd.doap b/ejabberd.doap
index 662dba347..47560781d 100644
--- a/ejabberd.doap
+++ b/ejabberd.doap
@@ -665,6 +665,15 @@
         <xmpp:note>mod_private</xmpp:note>
       </xmpp:SupportedXep>
     </implements>
+    <implements>
+      <xmpp:SupportedXep>
+        <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0421.html"/>
+        <xmpp:version>0.1.0</xmpp:version>
+        <xmpp:since></xmpp:since>
+        <xmpp:status></xmpp:status>
+        <xmpp:note>mod_muc_occupantid</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
     <implements>
       <xmpp:SupportedXep>
         <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0425.html"/>
diff --git a/src/mod_muc_opt.erl b/src/mod_muc_opt.erl
index c22a9594d..0d397abbb 100644
--- a/src/mod_muc_opt.erl
+++ b/src/mod_muc_opt.erl
@@ -86,7 +86,7 @@ db_type(Opts) when is_map(Opts) ->
 db_type(Host) ->
     gen_mod:get_module_opt(Host, mod_muc, db_type).
 
--spec default_room_options(gen_mod:opts() | global | binary()) -> [{atom(),'anyone' | 'false' | 'moderators' | 'nobody' | 'true' | 'undefined' | binary() | ['moderator' | 'participant' | 'visitor'] | pos_integer() | tuple()}].
+-spec default_room_options(gen_mod:opts() | global | binary()) -> [{atom(),'anyone' | 'false' | 'moderators' | 'nobody' | 'none' | 'participants' | 'true' | 'undefined' | binary() | ['moderator' | 'participant' | 'visitor'] | pos_integer() | tuple()}].
 default_room_options(Opts) when is_map(Opts) ->
     gen_mod:get_opt(default_room_options, Opts);
 default_room_options(Host) ->