howto in raidtools

[andrea gelmini]

hi all,
      why in raidtools-19981214-0.90.tar.gz there is
      software-raid mini-howto v0.20 18 September 1997?
      there's version 0.54 at
      http://linas.org/linux/Software-RAID/Software-RAID.html

thanks for your time,
andrea gelmini