diff --git a/Makefile b/Makefile
index c30125d..26161e6 100644
--- a/Makefile
+++ b/Makefile
@@ -49,6 +49,8 @@ clean-test: ## remove test and coverage artifacts
 
 lint: ## check style with flake8
 	flake8 hierarc tests
+	black .
+	docformatter -r ./* --black --in-place
 
 test: ## run tests quickly with the default Python
 	pytest