Add a note about localhost

Author: xPaw

_guides/reverse-proxies.md

@@ -21,6 +21,9 @@ It however requires more configuration than just relying on the built-in server,
 {: .alert.alert-warning role="alert"}
 When using The Lounge behind a reverse proxy, set the `reverseProxy` option to `true` in your configuration file. This will instruct The Lounge to use the `X-Forwarded-For` header passed by your reverse proxy.
 
+{: .alert.alert-danger role="alert"}
+We recommend changing `host` to `"127.0.0.1"` in the configuration to disallow direct access to The Lounge without going through the reverse proxy.
+
 This document assumes that your The Lounge is available on host `127.0.0.1` and port `9000`.
 
 ## [Nginx](https://nginx.org/en/)