diff --git a/README.md b/README.md
index 2e36526..07f3811 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/revelation.svg)](https://pypi.org/project/revelation/)
 [![Build Status](https://travis-ci.org/humrochagf/revelation.svg?branch=master)](https://travis-ci.org/humrochagf/revelation)
 [![Coverage Status](https://coveralls.io/repos/github/humrochagf/revelation/badge.svg?branch=master)](https://coveralls.io/github/humrochagf/revelation?branch=master)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
 
 [revelation](https://github.com/humrochagf/revelation) makes your
 [reveal.js](https://github.com/hakimel/reveal.js) presentations without the