diff --git a/tox.ini b/tox.ini
index dffb38a..14b0ad9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,7 @@ skip_install = true
 deps =
     black
 commands =
-    black --check autoapi tests
+    black --check --diff autoapi tests
 
 [testenv:lint]
 skip_install = true