diff --git a/docs/compose/.env b/docs/compose/.env
index a956bd12..06038bc8 100644
--- a/docs/compose/.env
+++ b/docs/compose/.env
@@ -107,6 +107,9 @@ WEBSITE=https://mailu.io
 # RECAPTCHA_PUBLIC_KEY=
 # RECAPTCHA_PRIVATE_KEY=
 
+# Domain registration, uncomment to enable
+# DOMAIN_REGISTRATION=true
+
 ###################################
 # Advanced settings
 ###################################