diff --git a/VoldNativeService.h b/VoldNativeService.h
index a00010b..dd2b854 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -33,6 +33,7 @@
 
     binder::Status setListener(const android::sp<android::os::IVoldListener>& listener);
 
+    binder::Status monitor();
     binder::Status reset();
     binder::Status shutdown();
     binder::Status mountAll();