diff --git a/CHANGES.txt b/CHANGES.txt
index c301e138cc..847e7729b1 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -358,6 +358,7 @@ Merged from 3.0:
  * Fix corrupted static collection deletions in 3.0 <-> 2.{1,2} messages (CASSANDRA-14568)
  * Handle failures in parallelAllSSTableOperation (cleanup/upgradesstables/etc) (CASSANDRA-14657)
  * Improve TokenMetaData cache populating performance avoid long locking (CASSANDRA-14660)
+ * Backport: Flush netty client messages immediately (not by default) (CASSANDRA-13651)
  * Fix static column order for SELECT * wildcard queries (CASSANDRA-14638)
  * sstableloader should use discovered broadcast address to connect intra-cluster (CASSANDRA-14522)
  * Fix reading columns with non-UTF names from schema (CASSANDRA-14468)
diff --git a/conf/cassandra.yaml b/conf/cassandra.yaml
index 2d5cdd3e14..dde4296aab 100644
--- a/conf/cassandra.yaml
+++ b/conf/cassandra.yaml
@@ -1267,8 +1267,8 @@ audit_logging_options:
 # on internal state and temporal relationships across events, accessible by clients via JMX.
 diagnostic_events_enabled: false
 
-# Define use of legacy delayed flusher for replies to TCP connections. This will increase latency, but might be beneficial for
-# legacy use-cases where only a single connection is used for each Cassandra node. Default is false.
+# Use native transport TCP message coalescing. If on upgrade to 4.0 you found your throughput decreasing, and in
+# particular you run an old kernel or have very fewer client connections, this option might be worth evaluating.
 #native_transport_flush_in_batches_legacy: false
 
 # Enable tracking of repaired state of data during reads and comparison between replicas