How do I trigger an fsck on boot for a drive not in fstab?

[Todd And Margo Chester]

Hi All,

SL 6.2, x64

I have an "ext 4" drive (/dev/sdb1)  I use for backup that is
deliberately not in my fstab.

"touch /forcefsck" will only force a check on my main ("/")
drive.

Question: is there a way to trigger an an fsck at boot on
this backup drive?

Many thanks,
-T