Arnold's Laws of Documentation:
(1) If it should exist, it doesn't.
(2) If it does exist, it's out of date.
(3) Only documentation for useless programs transcends the
first two laws.

Various documentation updates and bugfixes (the best way to know that a
stable kernel is approaching is to notice that somebody starts to
spellcheck the kernel - it has so far never failed)

I've seen people with new children before, they go from ultra happy to
looking like something out of a zombie film in about a week.

Just go ahead and write your own multitasking multiuser os!
Worked for me all the times.