diff --git a/PendingReleaseNotes.md b/PendingReleaseNotes.md
index 61686484f..98891f83b 100644
--- a/PendingReleaseNotes.md
+++ b/PendingReleaseNotes.md
@@ -7,5 +7,6 @@
 - deploy: podSecurityContexts can be configured for ceph-csi-cephfs chart in [PR](https://github.com/ceph/ceph-csi/pull/4664).
 - deploy: podSecurityContexts can be configured for ceph-csi-rbd chart in [PR](https://github.com/ceph/ceph-csi/pull/4668)
 - deploy: instanceID can be optionally configured for ceph-csi charts in [PR](https://github.com/ceph/ceph-csi/pull/4666)
+- rbd: add support for flattenMode option for replication in [PR](https://github.com/ceph/ceph-csi/pull/4678)
 
 ## NOTE