In the deepest parts of the ocean, where no light reaches, creatures navigate by memory and vibration. In the deepest parts of a codebase, developers navigate by documentation — if it exists.

Documentation is not busywork. It is the map you leave for the explorer who comes after you. Without it, every new developer must rediscover the terrain from scratch.

That is not a rite of passage. That is a design failure.

The person who will read your documentation most often is future you. And future you has forgotten everything. She does not remember why you chose that library. She does not remember what that environment variable does. She does not remember the workaround for that API bug.

Write for her. She will thank you.

Good documentation is never finished. It grows with the project, adapts to new decisions, and honestly reflects the current state of the system — not the idealized version you planned six months ago.

Keep it alive. Update it when things change. Delete the parts that lie.

The deep ones survive because they remember. Document everything.

— JP, from the void.