diff --git a/docs/rolereference.rst b/docs/rolereference.rst
index 6fb9da20f2964a33a342d6ae54d52b268029e5cb..b97e94c5798904a1f92822768431580540e240cd 100644
--- a/docs/rolereference.rst
+++ b/docs/rolereference.rst
@@ -1460,6 +1460,11 @@ Parameters
   be served with ``Strict-Transport-Security`` header with value of
   ``max-age=31536000; includeSubDomains``.
 
+**environment_variables** (dict, optional, ``{}``)
+  Specify additional environment variables that should be set for running the
+  service. Environment variables will be set in both the systemd service and for
+  the application's administrator user (when logged in as one).
+
 **fqdn** (string, mandatory)
   Fully-qualified domain name where the website is reachable. This value is used
   for calculating the user/group name for dedicated website user, as well as
@@ -1536,6 +1541,8 @@ running a bare Django project):
       virtualenv_packages:
         - django
       wsgi_application: django_example_com.wsgi:application
+      environment_variables:
+        DJANGO_SETTINGS_MODULE: "django_example_com.settings.production"
       https_tls_key: "{{ lookup('file', inventory_dir + '/tls/wsgi.example.com_https.key') }}"
       https_tls_certificate: "{{ lookup('file', inventory_dir + '/tls/wsgi.example.com_https.pem') }}"
       futures_version: 3.0.5