diff --git a/README.md b/README.md
index 171fd03..2886acc 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ services:
       - "50000-50500:50000-50500"
     volumes:
       - "/srv/ftps/auth:/auth"
+      - "/srv/fpts/extra.conf:/etc/proftpd/conf.d/extra.conf:ro"
       - "/srv/ftps/data:/home"
       - "/etc/letsencrypt:/certs"
     environment: