diff --git a/xep-0369.xml b/xep-0369.xml
index c030d35c..3ebc5753 100644
--- a/xep-0369.xml
+++ b/xep-0369.xml
@@ -2238,6 +2238,9 @@ the participant is not be subscribed to all nodes associated with the channel (i
     <p>
       The participant's server SHOULD ensure that only presence information from activated MIX clients is sent to the MIX channel.  So, if a user has two online clients, but only one is activated for a given MIX channel, then the channel SHOULD only receive presence information relating to the activated client.
     </p>
+    <p>
+      In order to present channels usefully to the end user a client MAY disco the domain of a roster entry to discover if it is a MIX service.   As MIX services MUST NOT support end users, this information MAY be cached help the client distinguish MIX channels in the roster.
+    </p>
   </section2>
 
   <section2 topic="MAM Archive Support" anchor="proxy-mam">