diff --git a/build.sh b/build.sh
index b65d1b7..6510d4a 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,12 @@
 # usage: build.sh oem os password twain
 #			the last parameter 'twain' is optional for building twain-ui, added on 2023-07-18
 
+if [ "${1}" == "?" ] || [ "${1}" == "--?" ] || [ "${1}" == "--help" ]; then
+	echo "  usage: "build.sh oem os password-of-this-machine
+	echo
+	exit
+fi
+
 oem=$1 							#厂商
 password="hg123123"				#电脑密码
 cpu=$(arch) 					#cpu架构