diff --git a/shadowsocks.sh b/shadowsocks.sh
index 6d163e7..77cb30b 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -169,6 +169,7 @@ uninstall)
     uninstall_shadowsocks
     ;;
 *)
-    echo "Usage: `basename $0` {install|uninstall)}"
+    echo "Arguments error! [${action} ]"
+    echo "Usage: `basename $0` {install|uninstall}"
     ;;
 esac
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