diff --git a/xep-0033.xml b/xep-0033.xml
index ab7df20c..4cda3526 100644
--- a/xep-0033.xml
+++ b/xep-0033.xml
@@ -284,6 +284,25 @@
         </section2>
     </section1>
 
+    <section1 topic='Business Rules' anchor='rules'>
+      <section2 topic='Directed Presence' anchor='presence'>
+        <p>To ensure that entities that have received directed
+        presence through a multicast service will get the unvailable
+        presence when the originating client closes the its session,
+        the multicast service should also relay unvailable presence
+        stanzas.</p>
+        <p>When transferring an extended addressing presence stanza,
+        the multicast service MUST keep track of the entities that
+        have received the individual directed presence packets.</p>
+        <p>When the multicast service receive an unavailable presence
+        stanza without extended addresses, it MUST broadcast the
+        updated presence to all the entities that have received a
+        directed presence previously (if the multicast service has not
+        yet sent unavailable presence to a precise entity through a
+        previous extended stanza presence).</p>
+      </section2>
+    </section1>
+    
     <section1 topic='Multicast Usage' anchor='multicast'>
         <p>The following usage scenario shows how messages flow through both address-enabled and non-address-enabled portions of the Jabber network.</p>