diff --git a/releasenotes/notes/implement_tuning_params-e627c774c0d0c9d2.yaml b/releasenotes/notes/implement_tuning_params-e627c774c0d0c9d2.yaml
index e5c258a..acfe55b 100644
--- a/releasenotes/notes/implement_tuning_params-e627c774c0d0c9d2.yaml
+++ b/releasenotes/notes/implement_tuning_params-e627c774c0d0c9d2.yaml
@@ -5,3 +5,6 @@ features:
     config files, mentioning those which have to be changed (defaults for the
     remaining ones are programmed in the template). Also "maxconn" global option
     made to be tunable.
+upgrade:
+  - The ``haproxy_bufsize`` variable has been removed and made a part of the
+    ``haproxy_tuning_params`` dictionary.