a) If ``REDIS_URL`` is already set, change it to ``PAPERLESS_REDIS`` and continue
to step 4.
b) Otherwise, in the ``docker-compose.yml`` add a new service for Redis,
- following `the example compose files <https://github.com/paperless-ngx/paperless-ngx/tree/main/docker/compose>`
+ following `the example compose files <https://github.com/paperless-ngx/paperless-ngx/tree/main/docker/compose>`_
b) Set the environment variable ``PAPERLESS_REDIS`` so it points to the new Redis container
4. Update user mapping