diff --git a/shell/alias/mkdir.sh b/shell/alias/mkdir.sh
index 52745dd..961e14b 100644
--- a/shell/alias/mkdir.sh
+++ b/shell/alias/mkdir.sh
@@ -1,10 +1,12 @@
 # make a directory
-alias md="\
-mkdir \
-"
+md() {
+	mkdir \
+		"${@}"
+}
 
 # make a directory after making its parents
-alias mdp="\
-mkdir \
---parents \
-"
+mdp() {
+	mkdir \
+		--parents \
+		"${@}"
+}