Please bear with me, I'm new to the whole Linux thing...

I just got a new Dell Inspiron 15 pre-loaded with Windows 8.1 and went through the process of resizing and formatting a new partition and installing Kali. After a couple tries, I got it installed with no problems, but now I want to add Windows to the GRUB menu so I can boot to it. I saw some other posts talking about using os-prober and updating the GRUB, but os-prober does not detect any other OS's. GParter shows the Windows partition as /dev/sda5. Can someone break it down Barney style and walk me through how to get Windows added? Thanks.