diff --git a/gmtsph-global.sh b/gmtsph-global.sh
index 52bb14b..ea31cd2 100755
--- a/gmtsph-global.sh
+++ b/gmtsph-global.sh
@@ -14,7 +14,7 @@ labels=("longitude (degree)" "latitude (degree)")
 plotgrad=0
 clon=0
 # 从命令行获取参数
-while getopts "hi:r:u:c:a:G:g" arg
+while getopts "hi:r:u:c:a:G:l:g" arg
 do
 	case $arg in
 		h)