zfs discuss - Mar 2007 - zpool(1M): import -a?

My copies of zpool(1M) have three entries for zpool import:

     zpool import [-d dir] [-D]
     zpool import [-d dir] [-D] [-f] [-o opts] [-R root] pool | id [newpool]
     zpool import [-d dir] [-D] [-f] [-a]

Shouldn''t the last one be

     zpool import [-d dir] [-D] [-f] -a

?  That is, if the -a is optional, how can we tell the difference
between it and the first version?


David