+ <para>Only query face indexed <replaceable>index</replaceable> of
+ each file.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-f</option>
+ <option>--format</option>
+ <option><replaceable>format</replaceable></option>
+ </term>
+ <listitem>
+ <para>Format output according to the format specifier
+ <replaceable>format</replaceable>.</para>