diff --git a/docs/u_e-postfix-attachment_size.md b/docs/u_e-postfix-attachment_size.md
index 079dda29e..3c37a6aba 100644
--- a/docs/u_e-postfix-attachment_size.md
+++ b/docs/u_e-postfix-attachment_size.md
@@ -1,4 +1,4 @@
-Open `data/conf/postfix/extra.cf` and set the `message_size_limit` accordingly in bytes.
+Open `data/conf/postfix/extra.cf` and set the `message_size_limit` accordingly in bytes. Siee `main.cf` for the default value.
 
 Restart Postfix: