diff --git a/README.md b/README.md
index 966ecdb3..b13028eb 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 ![Python package](https://github.com/alkemics/pandagg/workflows/Python%202%20Tests/badge.svg)
 [![Coverage](https://codecov.io/github/alkemics/pandagg/coverage.svg?branch=master)](https://codecov.io/gh/alkemics/pandagg)
 [![Docs](https://readthedocs.org/projects/pandagg/badge/?version=latest&style=flat)](https://pandagg.readthedocs.io/en/latest/)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 
 ## What is it?