Merge pull request #412 from freeroot/master

add infos from #409 in doc

.examples/README.md

@@ -92,9 +92,12 @@ If you want to update your installation to a newer version of nextcloud, repeat
 
 ### with-nginx-proxy
 The nginx proxy adds a proxy layer between nextcloud and the internet. The proxy is designed to serve multiple sites on the same host machine.
+
 The advantage in adding this layer is the ability to add a container for [Let's Encrypt](https://letsencrypt.org/) certificate handling.
 This combination of the [jwilder/nginx-proxy](https://github.com/jwilder/nginx-proxy) and [jrcs/docker-letsencrypt-nginx-proxy-companion](https://github.com/JrCs/docker-letsencrypt-nginx-proxy-companion) containers creates a fully automated https encryption of the nextcloud installation without worrying about certificate generation, validation or renewal.
 
+**This setup only works with a valid domain name on a server that is reachable from the internet.**
+
 To use this example complete the following steps:
 
 1. open `docker-compose.yml`