diff --git a/docs/content/advanced/mail-fetchmail.md b/docs/content/advanced/mail-fetchmail.md
index 4276e987..fa161d00 100644
--- a/docs/content/advanced/mail-fetchmail.md
+++ b/docs/content/advanced/mail-fetchmail.md
@@ -41,6 +41,8 @@ poll pop3.example.com proto pop3
 	is 'user2@domain.tld'
 ```
 
+__IMPORTANT__: Don’t forget the last line: e. g. `is 'user1@domain.tld'`. After `is` you have to specify one email address from the configuration file `config/postfix-accounts.cf`. 
+
 More details how to configure fetchmail can be found in the [fetchmail man page in the chapter “The run control file”](http://www.fetchmail.info/fetchmail-man.html#31). 
 
 # Debugging