[CentOS] help with mdadm/mount

Just upgraded from CentOS-3 to 5 (yeah - probably not the best idea)

I am using software raid

In order to ensure that I had enough space on /usr (which was a bit
tight), I had an extra partition that I changed to /usr/share

from /etc/fstab...

/dev/md5    /usr/share   ext3  defaults 1 2

but it won't mount up at boot. It will mount after boot if I issue the
command 'mount -a' (obviously because of the fstab entry).

Is there something like an mdadm label that I need to change?

Craig