Modifying archiso

[Robbie Smith <zoqaeski@xxxxxxxxx>]

The wiki gives instructions on modifying the ISO[1] and the last step is 
to recreate the actual ISO file. I've got my Arch installers on USB 
sticks, but is it absolutely necessary to do this?

Couldn't I just copy the root-image.fs.sfs to the appropriate directory 
on my USB (/path/to/USB/device/arch/x86_64/root-image.fs.sfs) instead, 
and regenerate the checksums?

[1]https://wiki.archlinux.org/index.php/Remastering_the_Install_ISO