[arch-general] Migrating /var to a different partition

Hi, I'm doing a clean install of Arch on a new computer, and during the install I'd already set aside 2GiB for the /var partition. Except I forgot to add it to fstab before I exited chroot, and booted into Arch and installed a DE etc. Now two days later I realize that Arch has already created a /var directory on the / partition. How do I migrate /var into the partition I'd originally created for it? Is it as simple as adding a line to fstab and rebooting? Thanks, Krishna