diff --git a/.env.template b/.env.template
index 9b09e8a3..c76e7c8d 100644
--- a/.env.template
+++ b/.env.template
@@ -77,6 +77,7 @@ GUNICORN_MEDIA=0
 # S3_QUERYSTRING_AUTH=1 # default true, set to 0 to serve media from a public bucket without signed urls
 # S3_QUERYSTRING_EXPIRE=3600 # number of seconds querystring are valid for
 # S3_ENDPOINT_URL= # when using a custom endpoint like minio
+# S3_CUSTOM_DOMAIN= # when using a CDN/proxy to S3 (see https://github.com/TandoorRecipes/recipes/issues/1943)
 
 # Email Settings, see https://docs.djangoproject.com/en/3.2/ref/settings/#email-host
 # Required for email confirmation and password reset (automatically activates if host is set)