diff --git a/share/man/man5/rc.conf.5 b/share/man/man5/rc.conf.5
index 3a310404c4f1..4deefd0d360b 100644
--- a/share/man/man5/rc.conf.5
+++ b/share/man/man5/rc.conf.5
@@ -1755,6 +1755,19 @@ This is intended to allow local mail submission via
 a localhost-only listening SMTP service required for running
 .Xr sendmail 8
 as a non-set-user-ID binary.
+.It Va sendmail_submit_flags
+.Pq Vt str
+If
+.Va sendmail_enable
+is set to
+.Dq Li NO
+and
+.Va sendmail_submit_enable
+is set to
+.Dq Li YES ,
+these are the flags to pass to the
+.Xr sendmail 8
+daemon.
 .It Va sendmail_outbound_enable
 .Pq Vt bool
 If set to