PLEASE NOTE: As of 2014, this page is grossly out of date. Ask on #minetest-dev.
Engine documentation is a way you can contribute to Minetest right now!
What we need
We want to document most or all of Minetest core with Doxygen-style code comments. The system for extracting information from those comments is not yet ready, but once we have comments in that format, it should be relatively simple to implement.