diff --git a/changes/v4.4.15-en.md b/changes/v4.4.15-en.md
index 800992cd0..88ad61ca6 100644
--- a/changes/v4.4.15-en.md
+++ b/changes/v4.4.15-en.md
@@ -8,3 +8,10 @@
 
 - Fix the problem that new MQTT TLS connections failed to establish after release hot upgrade [#9810](https://github.com/emqx/emqx/pull/9810).
   For more detailed information please see: [emqx/esockd#170](https://github.com/emqx/esockd/pull/170).
+
+- Fix a problem in the log message format of MQTT packets [#9858](https://github.com/emqx/emqx/pull/9858).
+  Before this fix, a comma was missing between the flags (DUP) of the fixed header
+  and the fields (ClientId) of the variable header:
+  ```
+  2023-01-29T13:40:36.567692+08:00 [debug] 127.0.0.1:50393 [MQTT] RECV CONNECT(Q0, R0, D0ClientId=test_client, ... Password=undefined)
+  ```
diff --git a/changes/v4.4.15-zh.md b/changes/v4.4.15-zh.md
index cb29bcfaa..6d2859e82 100644
--- a/changes/v4.4.15-zh.md
+++ b/changes/v4.4.15-zh.md
@@ -8,3 +8,9 @@
 
 - 修复版本热升级之后，新的 MQTT TLS 连接建立失败的问题 [#9810](https://github.com/emqx/emqx/pull/9810)。
   详情见：[emqx/esockd#170](https://github.com/emqx/esockd/pull/170)
+
+- 修复 MQTT 报文的日志打印格式的问题 [#9858](https://github.com/emqx/emqx/pull/9858)。
+  在此修复之前，固定报文头的标志位（DUP）和后面的可变报文头的字段（ClientId）之间漏掉了一个逗号做分隔：
+  ```
+  2023-01-29T13:40:36.567692+08:00 [debug] 127.0.0.1:50393 [MQTT] RECV CONNECT(Q0, R0, D0ClientId=test_client, ... Password=undefined)
+  ```