diff --git a/gmtsph-regional.sh b/gmtsph-regional.sh
index d2eceac..5a054dc 100755
--- a/gmtsph-regional.sh
+++ b/gmtsph-regional.sh
@@ -14,7 +14,7 @@ plot_para=(0 0 0 0)
 plotgrad=0
 nocpt=0
 # 从命令行获取参数
-while getopts "hi:r:u:c:a:gv:" arg
+while getopts "hi:r:u:c:a:gv:n" arg
 do
 	case $arg in
 		h)