diff --git a/deltachat-rpc-client/tox.ini b/deltachat-rpc-client/tox.ini
index 1c222e9a9..7f74daa37 100644
--- a/deltachat-rpc-client/tox.ini
+++ b/deltachat-rpc-client/tox.ini
@@ -25,5 +25,5 @@ deps =
     ruff
     black
 commands =
-    black --check src/ examples/ tests/
+    black --check --diff src/ examples/ tests/
     ruff src/ examples/ tests/
diff --git a/python/tox.ini b/python/tox.ini
index d01dd82e4..17905738f 100644
--- a/python/tox.ini
+++ b/python/tox.ini
@@ -56,7 +56,7 @@ deps =
     pygments
     restructuredtext_lint 
 commands =
-    black --check setup.py install_python_bindings.py src/deltachat examples/ tests/
+    black --check --diff setup.py install_python_bindings.py src/deltachat examples/ tests/
     ruff src/deltachat tests/ examples/
     rst-lint --encoding 'utf-8' README.rst