diff --git a/README.md b/README.md
index e808397..6bc7551 100644
--- a/README.md
+++ b/README.md
@@ -26,9 +26,9 @@ To invert the TXD pin on the FTDI device, programming the EEPROM is needed. With
 
 ### Commmon Distributions
 
-Make shure the device is recocntied as ttyUSB after plug in with `dmesg`.<br/>
-Edit the alarm.sh with your device name, like `/dev/ttyUSB0`. <br/>
-Run `bash ./alarm.sh` for starting the alarm.<br/>
+Make sure the device is after plug in recognized as ttyUSB with `dmesg`.<br/>
+Edit the alert.sh with your device name, like `/dev/ttyUSB0`. <br/>
+Run `bash ./alert.sh` for starting the alarm.<br/>
 
 ### openWrt
 
@@ -38,7 +38,31 @@ Run `bash ./alarm.sh` for starting the alarm.<br/>
 
 Make shure the device is recocntied as ttyUSB after plug in with `dmesg`.<br/>
 Edit the alarm.sh with your device name, like `/dev/ttyUSB0`. <br/>
-Run `bash ./alarm.sh` for starting the alarm.<br/>
+Run `bash ./alert.sh` for starting the alarm.<br/>
 
 ### Service
-todo
\ No newline at end of file
+`nano /etc/init.d/alarm`
+
+```
+#!/bin/sh /etc/rc.common
+
+START=99
+
+restart() {
+bash /root/alert.sh > /dev/null 2>&1 &
+bash /root/alert.sh start > /dev/null 2>&1 &    
+}
+
+start() {
+bash /root/alert.sh start > /dev/null 2>&1 &
+}
+
+stop() {
+bash /root/alert.sh > /dev/null 2>&1 &
+}
+```
+`chmod +x /etc/init.d/alarm`
+
+`/etc/init.d/alarm start`
+
+`/etc/init.d/alarm stop`
\ No newline at end of file