diff --git a/README.md b/README.md
index 7fb8393..2b5283d 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,7 @@ The default deployment is **fully public**:
 If you enable this in your `.env` file:
 
 ```
+COMPOSE_FILE="compose.yml:compose.auth.yml"
 AUTH_ENABLED=1
 AUTH_USERNAME=foobar
 SECRET_AUTH_PASSWORD_VERSION=v1