<para>Maximum number of seconds to wait for the event
queue to become empty. The default value is 120 seconds. A
value of 0 will check if the queue is empty and always
- return immediately.</para>
+ return immediately. A non-zero value will return an exit
+ code of 0 if queue became empty before timeout was reached,
+ non-zero otherwise.</para>
</listitem>
</varlistentry>
<varlistentry>