<varlistentry>
<term><option>-a</option></term>
- <term><option>-all</option></term>
+ <term><option>--all</option></term>
<listitem><para>When showing properties of
<citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,