diff --git a/CHANGELOG.md b/CHANGELOG.md
index f52ab2ec52..aabd99c941 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@
 * [CHANGE] Some files and directories created by Mimir components on local disk now have stricter permissions, and are only readable by owner, but not group or others. #4394
 * [CHANGE] Compactor: compactor will no longer try to compact blocks that are already marked for deletion. Previously compactor would consider blocks marked for deletion within `-compactor.deletion-delay / 2` period as eligible for compaction. #4328
 * [CHANGE] Memberlist: forward only changes, not entire original message. #4419
+* [CHANGE] Memberlist: don't accept old tombstones as incoming change, and don't forward such messages to other gossip members. #4420
 * [ENHANCEMENT] Add timeout for waiting on compactor to become ACTIVE in the ring. #4262
 * [ENHANCEMENT] Reduce memory used by streaming queries, particularly in ruler. #4341
 * [ENHANCEMENT] Ring: allow experimental configuration of disabling of heartbeat timeouts by setting the relevant configuration value to zero. Applies to the following: #4342