[1] page has the "Masks" part. There are two masks for x11-drivers/nvidia-drivers: [2]. But only one is shown. --- 1: https://packages.gentoo.org/packages/x11-drivers/nvidia-drivers 2: https://gitweb.gentoo.org/repo/gentoo.git/tree/profiles/package.mask
https://github.com/gentoo/soko/issues/19