+ <varlistentry>
+ <term><varname>SYSTEMD_READY=</varname></term>
+ <listitem><para>If set to 0, systemd
+ will consider this device unplugged
+ even if it shows up in the udev
+ tree. If this property is unset or set
+ to 1, the device will be considered
+ plugged if it is visible in the
+ udev tree. This property has no
+ influence on the behavior when a
+ device disappears from the udev
+ tree.</para>
+
+ <para>This option is useful to support
+ devices that initially show up in an
+ uninitialized state in the tree, and
+ for which a <literal>changed</literal>
+ event is generated the moment they are
+ fully set up. Note that
+ <varname>SYSTEMD_WANTS=</varname> (see
+ above) is not acted on as long as
+ <varname>SYSTEMD_READY=0</varname> is
+ set for a device.</para></listitem>
+ </varlistentry>
+