diff --git a/docs/content/advanced/mail-forwarding/relay-hosts.md b/docs/content/advanced/mail-forwarding/relay-hosts.md
index 73b6f339..3df5c873 100644
--- a/docs/content/advanced/mail-forwarding/relay-hosts.md
+++ b/docs/content/advanced/mail-forwarding/relay-hosts.md
@@ -53,6 +53,7 @@ An example configuration file looks like this:
 ```
 
 Combined with the previous configuration in `config/postfix-sasl-password.cf`, this will cause Postfix to deliver mail sent from domain1.com via `relay1.org:587`, authenticating as `relay_user_1`, and mail sent from domain2.com via `relay2.org:2525` authenticating as `relay_user_2`.
+Note: You still have to define RELAY_HOST to activate the feature
 
 ## Excluding Sender Domains