diff --git a/docs/index.rst b/docs/index.rst
index a9beddd..c51685e 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -19,6 +19,9 @@ It provides the following:
 
 .. _pyCOREPOS: https://pypi.org/project/pyCOREPOS/
 
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+   :target: https://github.com/psf/black
+
 
 .. toctree::
    :maxdepth: 2