[gnome-session: 2/4] doc: Add --builtin/--systemd options to manpage

[Ray Strode <halfline src gnome org>]

commit fffd116fdc97182a9503684bc9e1362a3b3a063b
Author: Benjamin Berg <bberg redhat com>
Date:   Mon Dec 9 16:26:41 2019 +0100

    doc: Add --builtin/--systemd options to manpage

 doc/man/gnome-session.1 | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/doc/man/gnome-session.1 b/doc/man/gnome-session.1
index eb4e2fbe..e27475df 100644
--- a/doc/man/gnome-session.1
+++ b/doc/man/gnome-session.1
@@ -2,6 +2,7 @@
 .\" gnome-session manual page.
 .\" (C) 2000 Miguel de Icaza (miguel helixcode com)
 .\" (C) 2009-2010 Vincent Untz (vuntz gnome org)
+.\" (C) 2019 Benjamin Berg (bberg redhat com)
 .\" (C) 2020 Sebastian Geiger (sbastig gmx net)
 .\"
 .TH GNOME-SESSION 1 "May 2020" "GNOME"
@@ -42,6 +43,14 @@ When this option is present, then default autostart directories will not be sear
 Use the applications defined in \fBSESSION.session\fP. If not specified,
 \fBgnome.session\fP will be used.
 .TP
+.I "--builtin"
+Use the legacy non-systemd method of managing the user session. This is the
+opposite of the \fI--systemd\fP option.
+.TP
+.I "--systemd"
+Use the systemd method of managing the user session. This is the opposite of
+the \fI--builtin\fP option.
+.TP
 .I "--failsafe"
 Run in fail-safe mode. User-specified applications will not be started.
 .TP