diff --git a/xep-0367.xml b/xep-0367.xml
index e4086f7e..39c83581 100644
--- a/xep-0367.xml
+++ b/xep-0367.xml
@@ -125,6 +125,10 @@
       <stanza-id> element with a 'by' attribute that matches the bare JID of
       the group chat, as defined in &xep0359;.
     </p>
+    <p>
+      This implies that group chat messages without a &xep0359; stanza-id cannot
+      be attached-to.
+    </p>
     <p>
       For other message types the attacher should use the 'id' from a XEP-0359
       &lt;origin-id&gt; if present, or the value of the 'id' attribute on the