diff --git a/Makefile b/Makefile
index cd1a32c..45976c3 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,9 @@
 main:
 	ocamlbuild ftest.native
 
+format:
+	ocp-indent --inplace src/*
+
 clean:
 	rm -rf _build/
 	rm ftest.native