diff --git a/docs/releasenotes.rst b/docs/releasenotes.rst
index 18e869b7a35cb90008d9e330525ef55f2a7065a9..30c2bd11c9bb21001e0e974e70fbc0a9053cf756 100644
--- a/docs/releasenotes.rst
+++ b/docs/releasenotes.rst
@@ -90,6 +90,8 @@ Breaking changes:
 
 * ``xmpp_server`` role
 
+  * Parameter ``xmpp_domains`` is now mandatory.
+
   * Use 2048-bit Diffie-Hellman parameters for relevant TLS
     ciphers. This could introduce incompatibility with older
     clients/servers trying to connect to the XMPP server.