diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index 148627628..dbbd94a6b 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -31,6 +31,7 @@ File format:
 * Fix Server-KeepAlive wrongly applied on MQTT v3.0/v3.1 [#7085]
 * Fix Stomp client can not trigger `$event/client_connection` message [#7096]
 * Fix system memory false alarm at boot
+* Fix the MQTT-SN message replay when the topic is not registered to the client [#6970]
 
 ## v4.3.12
 ### Important changes