diff --git a/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md b/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
index cc3bb710fece0df42ef6c372aa349156953abd10..5bbab366210ab5c920f97732f24d33e47f037468 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-screen-lock.md
@@ -226,7 +226,7 @@ screenlock.lock().then((data) => {
 
 onSystemEvent(callback: Callback<SystemEvent>): boolean
 
-注册锁屏相关的系统事件。
+注册锁屏相关的系统事件，仅系统锁屏应用可调用。
 
 **系统能力：** SystemCapability.MiscServices.ScreenLock