diff --git a/docs/usage.rst b/docs/usage.rst
index ce838f8719856baf58765811a656078ccf6f36fa..cad8584f4b670c9d6ab33942a76a8ff96d15d231 100644
--- a/docs/usage.rst
+++ b/docs/usage.rst
@@ -1827,6 +1827,8 @@ on the safe side:
           # Specify explicitly requirements for installing Gunicorn.
           wsgi_requirements:
             - gunicorn==20.0.4
+          wsgi_requirements_in:
+            - gunicorn
         - role: database
           db_name: wiki
           db_password: wiki