diff --git a/README.md b/README.md
index 3cfcd40..94b57d2 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ Run `bash ./alert.sh` for starting the alarm.<br/>
 ### openWrt
 
 `opkg update`<br/>
+`opkg install usbutils`<br/>
 `opkg install kmod-usb-serial`<br/>
 `opkg install kmod-usb-serial-ftdi`<br/>