diff --git a/mail_relay/defaults/main.yml b/mail_relay/defaults/main.yml
index 18ecb61..89a0e74 100644
--- a/mail_relay/defaults/main.yml
+++ b/mail_relay/defaults/main.yml
@@ -1,6 +1,6 @@
 ---
 # Every host sends its mail through the mailcow submission port with its own mailbox
-# (doc/host-mail-relay.md in the kubernetes repo). The password is set in host_vars.
+# (doc/security-perimeter.md in the kubernetes repo). The password is set in host_vars.
 mail_relay:
   host: tranio.ruekov.eu
   port: 587