Windows Entry for GRUB
This tutorial explains how to add Windows to GRUB if you are dual booting. This tutorial accounts for whether you are on an UEFI system or BIOS system.
First edit the grub.cfg file, and modify (hd1,1) according to your drive and partition number.
Determine the UUID for your EFI boot partition on your drive. Replace /dev/sdb3 with your EFI partition number.
Edit the grub.cfg file, and enter your UUID for the EFI partition from above.
This technique may also be used to add LiveCD entries to your GRUB menu with the following tutorial here.