diff --git a/docs/content/config/troubleshooting/faq.md b/docs/content/config/troubleshooting/faq.md
index be428e71..5f416a1d 100644
--- a/docs/content/config/troubleshooting/faq.md
+++ b/docs/content/config/troubleshooting/faq.md
@@ -63,6 +63,8 @@ Please have a look to the `README` in order to manage users and aliases.
     username:           <user1@domain.tld>
     password:           <mypassword>
 
+Please use `STARTTLS`.
+
 ### How can I manage my custom Spamassassin rules?
 Antispam rules are managed in `spamassassin/rules.cf`.