diff --git a/README.md b/README.md
index 5e9adaf7e95..67683aa9429 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,9 @@ As of 2019, Pillow development is
             <a href="https://pypi.org/project/Pillow/"><img
                 alt="Number of PyPI downloads"
                 src="https://img.shields.io/pypi/dm/pillow.svg"></a>
+            <a href="https://bestpractices.coreinfrastructure.org/projects/6331"><img
+                alt="CII Best Practices"
+                src="https://bestpractices.coreinfrastructure.org/projects/6331/badge"></a>
         </td>
     </tr>
     <tr>
diff --git a/docs/index.rst b/docs/index.rst
index c731e274600..115059ea105 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -69,6 +69,10 @@ Pillow for enterprise is available via the Tidelift Subscription. `Learn more <h
    :target: https://pypi.org/project/Pillow/
    :alt: Number of PyPI downloads
 
+.. image:: https://bestpractices.coreinfrastructure.org/projects/6331/badge
+   :target: https://bestpractices.coreinfrastructure.org/projects/6331
+   :alt: CII Best Practices
+
 Overview
 ========