<para>Unit files may contain additional options on top
of those listed here. If systemd encounters an unknown
option, it will write a warning log message but
- continue loading the unit. If an option is prefixed
- with <option>X-</option>, it is ignored completely by
- systemd. Applications may use this to include
- additional information in the unit files.</para>
+ continue loading the unit. If an option or section name
+ is prefixed with <option>X-</option>, it is ignored
+ completely by systemd. Options within an ignored
+ section do not need the prefix. Applications may use
+ this to include additional information in the unit
+ files.</para>
<para>Boolean arguments used in unit files can be
written in various formats. For positive settings the
case the kernel command line is
searched for the word appearing as is,
or as left hand side of an
- assignment. In the latter case the
+ assignment. In the latter case, the
exact assignment is looked for with
right and left hand side
matching.</para>