diff --git a/xep-0220.xml b/xep-0220.xml
index d223565d..694afb8f 100644
--- a/xep-0220.xml
+++ b/xep-0220.xml
@@ -27,6 +27,12 @@
     <surname>Hancke</surname>
     <jid>fippo@psyced.org</jid>
   </author>
+  <revision>
+    <version>0.5</version>
+    <date>2010-03-18</date>
+    <initials>ph</initials>
+    <remark><p>Added policy-violation and not-authorized error conditions</p></remark>
+  </revision>
   <revision>
     <version>0.4</version>
     <date>2009-08-05</date>
@@ -431,6 +437,16 @@ send: <db:verify
         <td>The Receiving Server encountered a problem with the connection to the Authoritative Server, for example if the Authoritative Server unexpectedly closed the stream without verifying the dialback key.</td>
         <td>Step 4</td>
       </tr>
+      <tr>
+        <td>&policy;</td>
+	<td>The Receiving Server enforces a policy which mandates usage of TLS before dialback and the Originating Server did send the dialback request without using TLS.</td>
+	<td>Step 3</td>
+      </tr>
+      <tr>
+        <td>&notauthorized;</td>
+	<td>The Receiving Server enforces a policy which requires a valid x509 certificate containing the identity of the Sender Domain for dialback requests and the Originating Server did not provide a certificate with an identity that matches the Sender Domain.</td>
+	<td>Step 3</td>
+      </tr>
     </table>
   </section2>