Put it in your fstab with the auto flag.
Here's an example from mine. The first line is from when I was mounting based on the mountpoint in /dev (remarked out). The second line is what I'm using now, the UUID (when I make these type of changes, I never delete--I always remark out. It makes undoing a mistake easier).
# /dev/sdb5 /media/sdb5 ext3 rw,user,auto 0 1
UUID=7900ade7-de36-41e5-88b5-2d7aaa8adcd4 /media/sdb5 ext3 rw,user,auto 0 1
Here's an LQ post on understanding fstab
Here's a good article on using UUIDs