Install Arch linux with win10 dual boot

https://wiki.archlinux.org/index.php/Beginners'_guide

one thing different, I already installed win10 and use UEFI-GPT.
and my ESP partition is /dev/sda1

so before

# pacstrap -i /mnt base base-devel

It has to mount /dev/sda1 to /mnt/boot first

and after

# arch-chroot /mnt /bin/bash

there should be vmlinuz-linux and initramfs-linux.img under /boot (aka /mnt/boot without chroot)

then

# mkinitcpio -p linux

it should work

also later

# bootctl install

it will install a new loader under /dev/sda1. And it won't overwrite win10 loader.
when boot with UEFI, press F12 in my laptop, I can see 3 boot entries, 1 Arch linux, 2 win10, 3 UEFI OS(??)