https://github.com/gentoo/portage/commit/c145e3cfcc016694f76488c21caaae37e3f3664e does not add info about '--write-timestamp' to man/egencache.1 https://github.com/gentoo/portage/commit/d705ea3a502d1e92e124a81101501906f8737110 does not add info about 'merges' to man/emaint.1
These are in git now: http://gitweb.gentoo.org/proj/portage.git/commit/?id=44f2a48390909050dd42404de9136bf78c97928e http://gitweb.gentoo.org/proj/portage.git/commit/?id=465565a0f90843133ae1ae9072244d34d82eaf73
Released in portage-2.2.18