diff --git a/en/application-dev/reference/apis/js-apis-screen-lock.md b/en/application-dev/reference/apis/js-apis-screen-lock.md
index c726ec7c8fdd4cd6f16d71f5a6892bc565b66cf6..f7f2a551648df0db4ad96733ef1a169f8fb42e14 100644
--- a/en/application-dev/reference/apis/js-apis-screen-lock.md
+++ b/en/application-dev/reference/apis/js-apis-screen-lock.md
@@ -226,7 +226,7 @@ screenlock.lock().then((data) => {
 
 onSystemEvent(callback: Callback<SystemEvent>): boolean
 
-Registers a callback for system events related to screen locking.
+Registers a callback for system events related to screen locking. This API can be called only by system screen lock applications.
 
 **System capability**: SystemCapability.MiscServices.ScreenLock