(via a <varname>Wants=</varname> type
dependency).</para>
+ <para>Note that these passive units cannot be started
+ manually, i.e. <literal>systemctl start
+ time-sync.target</literal> will fail with an
+ error. They can only be pulled in by dependency. This
+ is enforced since they exist for ordering purposes
+ only and thus are not useful as only unit within a
+ transaction.</para>
+
<variablelist>
<varlistentry>
<term><filename>local-fs-pre.target</filename></term>