diff --git a/README.md b/README.md
index 4f29f54..896a0a6 100644
--- a/README.md
+++ b/README.md
@@ -2,17 +2,18 @@
 xposed安卓虚拟摄像头  
 ## 感谢https://github.com/wangwei1237/CameraHook 提供的HOOK思路！！  
 ## 求有无极的大佬，希望帮忙测试一下此模块虚拟框架下是否可用，测试后希望在issue中反馈一下，谢谢！！！  
-### 注意：不是所有应用的拍照都调用`1000.bmp`，有很多app只是从`virtual.mp4`里截屏，只有在拍照时弹出“发现拍照”才是真正的调用`1000.bmp`!!
 
 ## 具体的使用方法(English version is below)：   
 1、安装xposed框架（传统xposed，edxp，lsposed等均可，不确定虚拟框架能否使用，已经确定VMOS可用，应用转生不可用）    
 2、安装模块，启用模块，lsposed等包含定义域的框架需要选勾目标app，但无需选勾系统框架。  
-3、将需要替换的视频命名为`virtual.mp4`，放在`/sdcard/DCIM/Camera1/`目录下。（前置摄像头需要水平翻转后右旋90°保存，onPreviewFrame需要匹配分辨率）  
+3、将需要替换的视频命名为`virtual.mp4`，放在`/sdcard/DCIM/Camera1/`目录下。（前置摄像头需要水平翻转后右旋90°保存，如果打开相机时看见“宽：...高：...”,则需要匹配分辨率）  
 4、若需要拦截拍照事件，请在`/sdcard/DCIM/Camera1/`目录下放置 `1000.bmp` 用于替换，（前置摄像头需要水平翻转后右旋90°保存，需要匹配分辨率）  
+> 注意：不是所有应用的拍照都调用`1000.bmp`，有很多app只是从`virtual.mp4`里截屏，只有在拍照时弹出“发现拍照”才是真正的调用`1000.bmp`
+
 5、**授予目标应用读取本地文件的权限，至少是允许读取媒体文件。**  
 6、强制结束目标应用/重启手机。  
 
-## 如何获得分辨率？？(仅拦截onPreviewFrame和拍照需要，其它系统自动处理)  
+## 如何获得分辨率？？(仅看见“宽：...高：...”需要)  
 在目标应用中打开摄像头，可在弹出的toast消息里看见。  
 
 ## Camera2接口有问题？？  
@@ -23,13 +24,15 @@ xposed安卓虚拟摄像头
 
 ## Detailed usage :
 1. Install this moudle. enable it in Xposed. Framework which has a scope list need to choose target app, but needn't to choose system framework.  
-2. Create `virtual.mp4` and put it under `/sdcard/DCIM/Camera1/` ,(if use front camera ,image should be Flip horizontal and right rotation 90 degrees, if you want to hook onPreviewFrame ,the resolution should be matched)  
-3. If you wants to hook image capture event, you should create `1000.bmp` under `/sdcard/DCIM/Camera1/` for replace. (if use front camera ,image should be Flip horizontal and right rotation 90 degrees, the resolution should be matched)  
-4. authorize the target app to access local storage in system.  
-5. Reboot your phone or shutdown target app.  
+2. Create `virtual.mp4` and put it under `/sdcard/DCIM/Camera1/` ,(if use front camera ,image should be Flip horizontal and right rotation 90 degrees, if you see "宽：...高：..." when opan camera, the resolution should be matched)   
+3. If you wants to hook image capture event, you should create `1000.bmp` under `/sdcard/DCIM/Camera1/` for replace. (if use front camera ,image should be Flip horizontal and right rotation 90 degrees, the resolution should be matched)    
+> ATTENTION: NOT all apps invoke `1000.bmp` when capture image, some apps directly capture a photo from `virtual.mp4`, when you see “发现拍照” when take photos, the app invoke `1000.bmp` .
+4. authorize the target app to access local storage in system.   
+5. Reboot your phone or shutdown target app.
+
 ## bugs with camera2 api, need to disable it?
 create `disable.jpg` under `/sdcard/DCIM/Camera1/` to disable this method hook.  
-## how to get resolution ??(only hook onPreviewFrame and image capture need it)?
+## how to get resolution ??(only needed if you see "宽：...高：...")?
 open camera in target app, and you can find resolution in toast message.  
 ## Needn't mute?
 Create `no-silent.jpg` under `/sdcard/DCIM/Camera1/`, and it will play sounds.