I have three partitions in my system. /dev/sda1, /dev/sda2 and /dev/sda3. /dev/sda1 is 50gb for system files for windows/dev/sda2 is for the partition where windows is installed/dev/sda3 is where arch linux and the grub is installedBut when I reboot the system, only the arch linux is showing on the menu. How would I add the windows partition in  the grub menu?
Cannot find the partition where I have installed windows after I have installed arch linux and grub
linux;arch linux;windows;grub2;grub