diff --git a/README.md b/README.md
index 69d69c56f..dbec36024 100644
--- a/README.md
+++ b/README.md
@@ -159,7 +159,7 @@ mypy -p git
 For automatic code formatting, run:
 
 ```bash
-black git
+black .
 ```
 
 Configuration for flake8 is in the `./.flake8` file.
diff --git a/tox.ini b/tox.ini
index 8d64b929b..82a41e22c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,7 +23,7 @@ ignore_outcome = true
 [testenv:black]
 description = Check style with black
 base_python = py39
-commands = black --check --diff git
+commands = black --check --diff .
 
 # Run "tox -e html" for this. It is deliberately excluded from env_list, as
 # unlike the other environments, this one writes outside the .tox/ directory.