diff --git a/xep-0369.xml b/xep-0369.xml
index ca76d132..63f71064 100644
--- a/xep-0369.xml
+++ b/xep-0369.xml
@@ -1086,16 +1086,99 @@
     <section3 topic='Sending Private Messages' anchor='usecase-user-private-messages'>
 
       <p>
-        A user may add a proxy JID from the participants node of a MIX channel to the user's roster.  This will enable convenient communication with the user through the MIX channel, without the user knowing the real JID of the channel participant.
+       Private Messages are used to provide communication with another channel participant through the MIX channel, without the initiating  user knowing the real JID of the channel participant.  A channel MAY support use of Private Messages.  Private messages are standard XMPP messages.   A message goes through a number of stages with different addressing.  This is set out in the following table.
       </p>
-      <p> AUTHOR'S NOTE:   To be expanded considerably. </p>
+      
+      <table>
+        <tr><th>Message</th><th>From</th><th>To</th></tr>
+        
+        <tr><td>First Message from Client to MIX Channel</td><td>Full JID of initiator's client</td><td>Proxy bare JID of responder</td></tr>
+        <tr><td>First Message from MIX Channel to responder's MIX Proxy</td><td>Proxy full JID of initiator's client</td><td>Bare JID of responder</td></tr>
+        <tr><td>First Message from responder's MIX Proxy to one or more of the responder's clients</td><td>Proxy full JID of initiator</td><td>Full JID of responder's client</td></tr>
+        
+        <tr><td>Messages from responder's client to MIX Channel</td><td>Full JID of responder's client</td><td>Proxy full JID of initiator's client</td></tr>
+        <tr><td>Messages from MIX channel to initiator's client</td><td>Proxy full JID of responder's client</td><td>Full JID of initiator's client</td></tr>
+        
+        <tr><td>Messages from initiator's client to MIX Channel</td><td>Full JID of initiator's client</td><td>Proxy full JID of responder's client</td></tr>
+        <tr><td>Message from MIX Channel to responder's client</td><td>Proxy full JID of initiator's client</td><td>Full JID of responder's client</td></tr>
+        
+      </table>
+      <p>Private Messages MAY be archived using MAM by the XMPP servers associated with initiator and responder.   Private Messages MUST NOT be archived by the MIX channel.</p>
     </section3>
 
 
 
     <section3 topic="Requesting vCard" anchor="usecase-vcard">
-      <p>A user may request the vCard of a channel participant by sending a request through the channel.</p>
-      <p> AUTHOR'S NOTES:   To be expanded considerably. ( is essentially "send the vCard request to the bare Proxy JID")</p>
+      <p>A user may request the vCard of a channel participant by sending a request through the channel.  The request may be sent directly by the client or through a MIX Proxy.  The MIX channel MAY pass this request on or may block it.  In the following example, the requesting client sends a message to the anonymized bare JID of the channel participant for which the vCard is desired.</p>
+      
+      
+      
+      
+      <example caption="Client directly requests vCard through channel" ><![CDATA[
+<iq from='hag66@shakespeare.example/intibo24'
+    id='lx09df27'
+    to='coven+989898@mix.shakespeare.example'
+    type='get'>
+  <vCard xmlns='vcard-temp'/>
+</iq>
+]]></example>
+      <p>The MIX channel MAY pass on the vCard request or may reject with an error, dependent on channel policy.  The MIX service will then address the vCard request to the MIX proxy (bare JID) using an anonymous full proxy JID to hide the requester.  </p>
+      
+      <example caption="Channel passes on vCard request to MIX Proxy" ><![CDATA[
+<iq from='coven+123456@mix.shakespeare.example/6789'
+    id='lx09df27'
+    to='peter@shakespeare.lit'
+    type='get'>
+  <vCard xmlns='vcard-temp'/>
+</iq>
+]]></example>    
+      
+    <p>
+      The MIX Proxy, on behalf of the user, MAY send a response or reject with an error.   The MIX Proxy will send the vCard back to the channel.
+    </p>  
+      <example caption="Service responds with Disco Info result" ><![CDATA[
+<iq from='peter@shakespeare.lit'
+    id='lx09df27'
+    to='coven+123456@mix.shakespeare.example/6789'
+    type='result'>
+    <vCard xmlns='vcard-temp'>
+    <FN>Peter Saint-Andre</FN>
+    <N>
+      <FAMILY>Saint-Andre</FAMILY>
+      <GIVEN>Peter</GIVEN>
+      <MIDDLE/>
+    </N>
+    <NICKNAME>stpeter</NICKNAME>
+    <URL>http://www.xmpp.org/xsf/people/stpeter.shtml</URL>
+  </vCard>
+    
+  <query xmlns='http://jabber.org/protocol/disco#info'>
+</iq>
+]]></example>
+      
+      <p>
+        The MIX channel will then send the vCard response to the requesting client on behalf of the client sending the response.
+      </p>
+      
+      <example caption="Service responds with Disco Info result" ><![CDATA[
+<iq from='coven+989898@mix.shakespeare.example'
+    id='lx09df27'
+    to='hag66@shakespeare.example/intibo24'
+    type='result'>
+ <vCard xmlns='vcard-temp'>
+    <FN>Peter Saint-Andre</FN>
+    <N>
+      <FAMILY>Saint-Andre</FAMILY>
+      <GIVEN>Peter</GIVEN>
+      <MIDDLE/>
+    </N>
+    <NICKNAME>stpeter</NICKNAME>
+    <URL>http://www.xmpp.org/xsf/people/stpeter.shtml</URL>
+  </vCard>   
+</iq>
+]]></example>
+      
+     
     </section3>
   </section2>