diff --git a/docs/releasenotes.rst b/docs/releasenotes.rst
index ed9e8fbca4c93cdce7c7cbd71a030c7bd3e21db3..409a822d9e3737b12f2626bb6b7574de828d64bc 100644
--- a/docs/releasenotes.rst
+++ b/docs/releasenotes.rst
@@ -34,6 +34,12 @@ run applications using Debian-only repositories.
   * Updated default package pins for virtual environments used to
     check for available pip package upgrades.
 
+* ``mail_server`` role
+
+  * Added parameter ``mail_server_smtp_additional_configuration`` that
+    provides ability to include additional configuration directives
+    for the SMTP server.
+
 * ``xmpp_server`` role
 
   * Drop dependency on the external (Prosody) package