diff --git a/docs/portainer.md b/docs/portainer.md
index 7dba226dd..fe9f2ed7a 100644
--- a/docs/portainer.md
+++ b/docs/portainer.md
@@ -6,6 +6,7 @@ In order to enable Portainer, the docker-compose.yml and site.conf for nginx mus
       image: portainer/portainer
       volumes:
         - /var/run/docker.sock:/var/run/docker.sock
+        - /opt/portainer/data:/data
       restart: always
       dns:
         - 172.22.1.254