Meaning of --all was mentioned in list-dependencies description, but the this
effect should also be mentioned in the description of the option itself.
<para>To list all units installed in the file system, use the
<command>list-unit-files</command> command instead.</para>
+
+ <para>When listing units with <command>list-dependencies</command>, recursively show
+ dependencies of all dependent units (by default only dependencies of target units are
+ shown).</para>
</listitem>
</varlistentry>