diff --git a/Makefile b/Makefile
index ef9ff0b..997e080 100644
--- a/Makefile
+++ b/Makefile
@@ -21,3 +21,6 @@ clean:
 
 install: pacakge
 	# install
+
+shfmt:
+	find . -type f -name "*.sh" -exec shfmt -w -i 2 {} \;