diff --git a/README.rst b/README.rst
index fcc0ea0..942fe83 100644
--- a/README.rst
+++ b/README.rst
@@ -26,6 +26,9 @@ hierArc
 .. image:: https://img.shields.io/badge/%20formatter-docformatter-fedcba.svg
     :target: https://github.com/PyCQA/docformatter
 
+.. image:: https://img.shields.io/badge/%20style-sphinx-0a507a.svg
+    :target: https://www.sphinx-doc.org/en/master/usage/index.html
+
 
 
 Hierarchical analysis of strong lensing systems to infer lens properties and cosmological parameters simultaneously.