diff --git a/docs/manual/contribute.adoc b/docs/manual/contribute.adoc
index f82eb14303..6ac75fb66a 100644
--- a/docs/manual/contribute.adoc
+++ b/docs/manual/contribute.adoc
@@ -380,6 +380,9 @@ $ git send-email origin/master
 Note that +git+ should be configured to use your mail account.
 To configure +git+, see +man git-send-email+ or https://git-send-email.io/.
 
+The mail account used has to be subscribed to the mailing list,
+otherwise your message will be automatically rejected.
+
 If you do not use +git send-email+, make sure posted *patches are not
 line-wrapped*, otherwise they cannot easily be applied. In such a case,
 fix your e-mail client, or better yet, learn to use +git send-email+.