1. Find out the UUID of the home partition you're trying to mount: blkid
2. edit /etc/crypttab and add the following line:
my-encrypted-home UUID="<UUID-from-above-command>" none luks
3. edit /etc/fstab and comment out the previous home entry and add the following:
/dev/mapper/my-encrypted-home /home     ext4    defaults    1 2