diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15bbbd8351..b1a3378362 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 * [CHANGE] Querier: Mark `-querier.ingester-streaming` flag as deprecated. Now query ingester streaming is always enabled. #5817
 * [CHANGE] Compactor/Bucket Store: Added `-blocks-storage.bucket-store.block-discovery-strategy` to configure different block listing strategy. Reverted the current recursive block listing mechanism and use the strategy `Concurrent` as in 1.15. #5828
 * [CHANGE] Compactor: Don't halt compactor when overlapped source blocks detected. #5854
+* [CHANGE] S3 Bucket Client: Expose `-blocks-storage.s3.send-content-md5` flag and set default checksum algorithm to MD5. #5870
 * [FEATURE] OTLP ingestion experimental. #5813
 * [FEATURE] Ingester: Add per-tenant new metric `cortex_ingester_tsdb_data_replay_duration_seconds`. #5477
 * [FEATURE] Query Frontend/Scheduler: Add query priority support. #5605