Some years back, I was caught in a weak moment and somehow became the
kernel documentation maintainer. More recently, I’ve given a few talks on
the state of kernel documentation and the sort of work that needs to be
done to make things better. A key part of getting that work done is
communicating to potential contributors the tasks that they might helpfully
take on — a list that was, naturally, entirely undocumented. To that end,
a version of the following document is currently under review and headed
for the mainline. Read on to see how you, too, can help to make the
kernel’s documentation better.

Source: LWN.net – [$] How to contribute to kernel documentation