From d5ea374435668c11a6e63fedd04b6691e9345536 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Peters?= <andre.peters@debinux.de>
Date: Mon, 29 Jan 2018 08:16:53 +0100
Subject: [PATCH] Update third_party-portainer.md

---
 docs/third_party-portainer.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/third_party-portainer.md b/docs/third_party-portainer.md
index ea6c01d35..c3f4270d6 100644
--- a/docs/third_party-portainer.md
+++ b/docs/third_party-portainer.md
@@ -2,6 +2,8 @@ In order to enable Portainer, the docker-compose.yml and site.conf for Nginx mus
 
 1\. Create a new file `docker-compose.override.yml` in the mailcow-dockerized root folder and insert the following configuration
 ```
+version: '2.1'
+services:
     portainer-mailcow:
       image: portainer/portainer
       volumes: