diff --git a/docs/configuration/mandatory-settings.md b/docs/configuration/mandatory-settings.md
index 07a6d8ede..8d96cf3a7 100644
--- a/docs/configuration/mandatory-settings.md
+++ b/docs/configuration/mandatory-settings.md
@@ -2,7 +2,7 @@ NetBox's local configuration is held in `netbox/netbox/configuration.py`. An exa
 
 ## ALLOWED_HOSTS
 
-This is a list of valid fully-qualified domain names (FQDNs) for the NetBox server. NetBox will not permit write access to the server via any other hostnames. The first FQDN in the list will be treated as the preferred name.
+This is a list of valid fully-qualified domain names (FQDNs) that is used to reach the NetBox service. Usually this is the same as the hostname for the NetBox server, but can also be different (e.g. when using a reverse proxy serving the NetBox website under a different FQDN than the hostname of the NetBox server). NetBox will not permit access to the server via any other hostnames (or IPs). The value of this option is also used to set `CSRF_TRUSTED_ORIGINS`, which restricts `HTTP POST` to the same set of hosts (more about this [here](https://docs.djangoproject.com/en/1.9/ref/settings/#std:setting-CSRF_TRUSTED_ORIGINS)). Keep in mind that NetBox, by default, has `USE_X_FORWARDED_HOST = True` (in `netbox/netbox/settings.py`) which means that if you're using a reverse proxy, it's the FQDN used to reach that reverse proxy which needs to be in this list (more about this [here](https://docs.djangoproject.com/en/1.9/ref/settings/#allowed-hosts)).
 
 Example: