Another, often-overlooked source of “documentation” is the change-history in the version control system, and any defect-reporting system records that you may have. (And you do have them and you do use them, don't you?... Ahh, yes. Of course you do. Of course.)
When you’re fixing a bug that was reported in the defect tracking system, record the defect-number in the comment. When you check-in the change, update the defect record to show it. This lets you perceive exactly what has changed in a module over time, and why.
This is a “dynamic” form of information, analogous to the “running log” that was routinely kept in the engine-room, or the “captain’s log” (“Stardate 4523.3 ...”) that was kept on the bridge.
Bonus Question: what happened on that stardate?
Extra Vulcan-points if you don’t have to Google it...
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