diff --git a/mailserver.env b/mailserver.env
index 7f493a3a..44a9a484 100644
--- a/mailserver.env
+++ b/mailserver.env
@@ -362,7 +362,7 @@ POSTFIX_REJECT_UNKNOWN_CLIENT_HOSTNAME=0
 POSTFIX_INET_PROTOCOLS=all
 
 # Enables MTA-STS support for outbound mail.
-# More details: https://docker-mailserver.github.io/docker-mailserver/latest/config/advanced/mail-mta-sts/
+# More details: https://docker-mailserver.github.io/docker-mailserver/v13.3/config/best-practices/mta-sts/
 # - **0** ==> MTA-STS disabled
 # - 1 => MTA-STS enabled
 ENABLE_MTA_STS=0