diff --git a/docs/releasenotes.rst b/docs/releasenotes.rst
index d8e2a1da664917ef51344384ad1ec7307e848954..a53321062b262897f9aafe690c38bf21ddc0876e 100644
--- a/docs/releasenotes.rst
+++ b/docs/releasenotes.rst
@@ -32,6 +32,14 @@ New features/improvements:
 * Tests have been updated to work with latest Molecule/Testinfra as
   part of the Ansible upgrade process.
 
+Deprecations:
+
+* ``backup_server`` and ``backup_client`` role
+
+  * Officially dropped support for DSA keys (this was mainly remnant
+    from Debian 8 Jessie support, on Debian 9 Stretch and upwards the
+    DSA keys were not supported at all).
+
 
 4.0.0
 -----