diff --git a/tox.ini b/tox.ini
index 89fa5d0..fb2ccdd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,4 +44,4 @@ deps =
     black
 commands =
     {[testenv:lint]commands}
-    black --check .
+    black --check --diff .