diff --git a/mailserver.env b/mailserver.env
index 580b98a4..e817f991 100644
--- a/mailserver.env
+++ b/mailserver.env
@@ -9,16 +9,13 @@
 # --- General Section ---------------------------
 # -----------------------------------------------
 
-# empty => uses the `hostname` command to get the mail server's canonical hostname
-# => Specify a fully-qualified domainname to serve mail for.  This is used for many of the config features so
-# if you can't set your hostname (e.g. you're in a container platform that doesn't let you) specify it in
-# this environment variable.
-# **WARNING**: Setting OVERRIDE_HOSTNAME can have difficult to predict side effects.
+# **empty** => Internally uses the `hostname --fqdn` command to get the canonical hostname assigned to the DMS container.
+# => Specify an FQDN (fully-qualified domain name) to serve mail for. The hostname is required for DMS to function correctly
+#
+# **WARNING**: Setting OVERRIDE_HOSTNAME can have difficult to predict side effects:
+# https://docker-mailserver.github.io/docker-mailserver/latest/config/environment/#override_hostname
 OVERRIDE_HOSTNAME=
 
-# REMOVED in version v11.0.0! Use LOG_LEVEL instead.
-DMS_DEBUG=0
-
 # Set the log level for DMS.
 # This is mostly relevant for container startup scripts and change detection event feedback.
 #