diff --git a/README.md b/README.md
index 7ab77af..ce2e496 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ python run.py -c /path/to/config.json
 * `public`使用公网ip(使用公网API查询)
 * `nku` NKU网关ip(只支持ipv4)
 
-## example
+### 配置example
 
 ```json
 {
@@ -53,3 +53,14 @@ python run.py -c /path/to/config.json
 	"debug": true
 }
 ```
+
+## 定时任务
+默认没5分钟检查一次ip变化,自动更新
+
+### windows
+**需要已经安装python**
+* 以当前用户身份运行定时任务,双击或者运行`task.bat` (执行时会闪黑框)
+* 以系统身份运行定时任务,双击或者运行`task.bat` (右键管理员身份运行)
+
+### linux
+运行 `sudo ./task.sh`
\ No newline at end of file
diff --git a/task.bat b/task.bat
index ad9fc24..2482ee3 100644
--- a/task.bat
+++ b/task.bat
@@ -6,5 +6,12 @@ REM [/RU username [/RP [password]] /SC schedule [/MO modifier] [/D day]
 REM [/M months] [/I idletime] /TN taskname /TR taskrun [/ST starttime]
 REM [/RI interval] [ {/ET endtime | /DU duration} [/K] 
 REM [/XML xmlfile] [/V1]] [/SD startdate] [/ED enddate] [/IT] [/Z] [/F]
-schtasks /Create /SC MINUTE /MO 5 /TR "%~dp0run.bat" /TN DDNS
+
+IF %ERRORLEVEL% EQU 0 (
+  echo run task as SYSTEM
+  schtasks /Create /SC MINUTE /MO 5 /TR "%~dp0run.bat" /TN "DDNS" /F /RU "SYSTEM"
+) ELSE (
+  echo run task as USER
+  schtasks /Create /SC MINUTE /MO 5 /TR "%~dp0run.bat" /TN "DDNS" /F
+) 
 PAUSE