+ <varlistentry>
+ <term><filename>system-update.target</filename></term>
+ <listitem>
+ <para>A special target unit
+ that is used for off-line
+ system updates.
+ <citerefentry><refentrytitle>systemd-system-update-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ will redirect the boot process
+ to this target if
+ <filename>/system-update</filename>
+ exists. For more information
+ see the <ulink
+ url="http://freedesktop.org/wiki/Software/systemd/SystemUpdates">System
+ Updates
+ Specification</ulink>.</para>
+ </listitem>
+ </varlistentry>