diff --git a/postfix.cf.tmpl b/postfix.cf.tmpl
index 80e4edf..5ba7305 100644
--- a/postfix.cf.tmpl
+++ b/postfix.cf.tmpl
@@ -2,6 +2,8 @@
 # https://mailu.io/1.7/faq.html?highlight=override#how-can-i-override-settings
 # https://github.com/Mailu/Mailu/blob/master/core/postfix/conf/main.cf
 
+# Please note, this config assumes "recipient_delimiter = +" in the main.cf
+
 unknown_local_recipient_reject_code = 550
 owner_request_special = no