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-rw-r--r--man/systemd.xml14
1 files changed, 10 insertions, 4 deletions
diff --git a/man/systemd.xml b/man/systemd.xml
index f0fea5d0fe..6aa4f70527 100644
--- a/man/systemd.xml
+++ b/man/systemd.xml
@@ -141,14 +141,20 @@
<listitem><para>Tell systemd to run a
system instance (resp. session
instance), even if the process ID is
- not 1 (resp. is 1), i.e. systemd is not
- (resp. is) run as init process.
+ not 1 (resp. is 1), i.e. systemd is
+ not (resp. is) run as init process.
Normally it should not be necessary to
pass these options, as systemd
automatically detects the mode it is
started in. These options are hence of
- little use except for
- debugging.</para></listitem>
+ little use except for debugging. Note
+ that it is not supported booting and
+ maintaining a full system with systemd
+ running in <option>--system</option>
+ mode, but PID not 1. In practice,
+ passing <option>--system</option> explicitly is
+ only useful in conjunction with
+ <option>--test</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--dump-core</option></term>