<para>If the <option>systemd.mask=</option> or <option>rd.systemd.mask=</option>
option is specified and followed by a unit name, this unit is
- masked for the runtime, similar to the effect of
+ masked for the runtime (i.e. for this session - from boot to shutdown), similar to the effect of
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
<command>mask</command> command. This is useful to boot with
certain units removed from the initial boot transaction for