From b042dd687c8dc50cef6d7355d9790a2a1791ec27 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 12 Jul 2019 09:18:59 +0200
Subject: [PATCH] man: document that the supplementary groups list is
 initialized from User='s database entry

Fixes: #12936
---
 man/systemd.exec.xml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 48dd42ca3c..f9c3f41890 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -226,7 +226,12 @@
         specified user and group must have been created statically in the user database no later than the moment the
         service is started, for example using the
         <citerefentry><refentrytitle>sysusers.d</refentrytitle><manvolnum>5</manvolnum></citerefentry> facility, which
-        is applied at boot or package install time.</para></listitem>
+        is applied at boot or package install time.</para>
+
+        <para>If the <varname>User=</varname> setting is used the supplementary group list is initialized
+        from the specified user's default group list, as defined in the system's user and group
+        database. Additional groups may be configured through the <varname>SupplementaryGroups=</varname>
+        setting (see below).</para></listitem>
       </varlistentry>
 
       <varlistentry>
-- 
2.25.1