diff --git a/MiNote/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java b/MiNote/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java
index 54e503b..e011347 100644
--- a/MiNote/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java
+++ b/MiNote/app/src/main/java/net/micode/notes/ui/AlarmReceiver.java
@@ -20,11 +20,15 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 
+//这是实现alarm这个功能最接近用户层的包，基于上面的两个包，
 public class AlarmReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
         intent.setClass(context, AlarmAlertActivity.class);
+        //启动AlarmAlertActivity
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        //activity要存在于activity的栈中，而非activity的途径启动activity时必然不存在一个activity的栈
+        //所以要新起一个栈装入启动的activity
         context.startActivity(intent);
     }
 }