--- /dev/null
+# GitHub Actions integration
+
+You can use _Black_ within a GitHub Actions workflow without setting your own Python
+environment. Great for enforcing that your code matches the _Black_ code style.
+
+## Compatibility
+
+This action is known to support all GitHub-hosted runner OSes. In addition, only
+published versions of _Black_ are supported (i.e. whatever is available on PyPI).
+
+Finally, this action installs _Black_ with both the `colorama` and `python2` extras so
+the `--color` flag and formatting Python 2 code are supported.
+
+## Usage
+
+Create a file named `.github/workflows/black.yml` inside your repository with:
+
+```yaml
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+ lint:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v2
+ - uses: psf/black@stable
+```
+
+We recommend the use of the `@stable` tag, but per version tags also exist if you prefer
+that. Note that the action's version you select is independent of the version of _Black_
+the action will use.
+
+The version of _Black_ the action will use can be configured via `version`. The action
+defaults to the latest release available on PyPI. Only versions available from PyPI are
+supported, so no commit SHAs or branch names.
+
+You can also configure the arguments passed to _Black_ via `options` (defaults to
+`'--check --diff'`) and `src` (default is `'.'`)
+
+Here's an example configuration:
+
+```yaml
+- uses: psf/black@stable
+ with:
+ options: "--check --verbose"
+ src: "./src"
+ version: "21.5b1"
+```