diff --git a/docs/contributing.rst b/docs/contributing.rst
index 198af724..d46c9ecf 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -159,6 +159,11 @@ In order to prepare a new release, we are following the following steps:
 .. code-block:: bash
 
      $ make build-requirements
+- If needed, recompress assets. It requires zopflipng:
+
+.. code-block:: bash
+
+     $ make compress-assets
 
 Once this is done, use the "release" instruction: