diff --git a/xep-0280.xml b/xep-0280.xml
index 59b3706f..c2884137 100644
--- a/xep-0280.xml
+++ b/xep-0280.xml
@@ -45,6 +45,12 @@
     <email>linuxwolf@outer-planes.net</email>
     <jid>linuxwolf@outer-planes.net</jid>
   </author>
+  <revision>
+    <version>0.13.1</version>
+    <date>2019-09-11</date>
+    <initials>gl</initials>
+    <remark><p>Add clear example on problematic (spoofed) carbon messages and that they need to be handled.</p></remark>
+  </revision>
   <revision>
     <version>0.13.0</version>
     <date>2019-04-24</date>