diff --git a/README.md b/README.md
index a908bc8..71b58c3 100644
--- a/README.md
+++ b/README.md
@@ -400,7 +400,7 @@ The URL to ping after a loop of sending emails is complete. This can be used to
 
 ### Relay Service
 
-At a minimum, you should configure how the relay service will connect to your SMTP server, which, depending on your SMTP server, can include any or all the following Django settings:
+At a minimum, you should configure the relay service's connection to the database and how it will connect to your SMTP server, which, depending on your SMTP server, can include any or all the following Django settings:
 
 - `EMAIL_HOST`
 - `EMAIL_PORT`
@@ -417,6 +417,8 @@ When running the relay service using Docker, config values are set via environme
 
 For settings that are dictionaries, a `__` is used to separate the keys, e.g., to set `DATABASES["default"]["CONN_MAX_AGE"]` to `600` or 10 minutes, you would set `-e "DATABASES__default__CONN_MAX_AGE=600"`.
 
+For the database connection, [`dj-database-url`](https://github.com/jazzband/dj-database-url) is used to parse the `DATABASE_URL` environment variable, e.g., `-e "DATABASE_URL=postgres://email_relay_user:email_relay_password@localhost:5432/email_relay_db"`.
+
 #### Django
 
 When running the relay service from a Django project, config values are read from the Django settings for that project.