How should I document a bug so I understand it later?

Write as if for a stranger, because future you will have forgotten all of today's context. Capture the reproduction steps and conditions while they are fresh, the expected versus actual behavior, any error output and the build version, and your current understanding of the cause. The note has to stand entirely on its own.

Why do my old bug notes never make sense later?

Because they relied on mental context that has since evaporated, what you were doing, why it mattered, how it broke, all of which made a terse note sufficient at the time. Future you remembers none of it, so a note that depends on that context becomes incomprehensible. Documenting for a stranger who happens to be you fixes this.

What is the most important thing to capture about a bug?

The reproduction, the exact conditions and steps that trigger it, because a bug you cannot reproduce is one you cannot fix, and the moment you encounter it is the only time the repro is easy to capture. Surround it with expected-versus-actual behavior, logs, version, and your hunch about the cause to give future you a complete, actionable picture.

How to Document Bugs So Future You Understands Them

Quick answer: Capture the reproduction, the context, and your current understanding while it is fresh, in enough detail that you could act on it cold months later. Documenting a bug well is writing for a stranger who happens to be you, future you remembers nothing, so the report has to carry everything.

A bug you log today with a terse 'menu thing broken' makes complete sense right now, because all the context is in your head. Three months later, when you finally get to it, that note is useless, you have no idea what menu, what thing, or how it broke. Documenting bugs so future you can understand them means capturing enough context now that you could act on the bug cold, with none of today's mental context, because future you will have exactly none of it.

Future You Remembers Nothing

The core insight is that the version of you who eventually fixes a bug has forgotten everything you know about it right now. The mental context that makes a one-word note sufficient today, what you were doing, what the expected behavior was, why it seemed important, evaporates within days. So a bug note that relies on that context is a note that will be incomprehensible by the time you use it. Write as if for a stranger, because future you effectively is one.

This is especially acute for solo and part-time developers, where a bug might sit in the backlog for months before you reach it, and there is no teammate whose memory can fill the gaps. The documentation has to stand entirely on its own, because there is nothing and no one to supplement it later.

Capture the Reproduction and Context While Fresh

The single most valuable thing to document is how to reproduce the bug: the exact conditions and steps that trigger it. A bug you cannot reproduce is a bug you cannot fix, and the moment you have the repro in hand, right when you encounter it, is the only time it is easy to capture. Write down the steps, the state, and the platform or settings involved while they are fresh, before they fade.

Surround the repro with the context that makes it actionable: what you expected versus what happened, any error or log output, and the build version. Bugnet captures much of this automatically with each report, logs, device context, version, a screenshot, so the technical context is preserved without you having to manually transcribe it. For bugs you find yourself, add the repro steps and your observations to that captured base, and future you inherits a complete picture.

Record Your Current Understanding

Beyond the repro, document what you currently think about the bug, your hunch about the cause, the area of code involved, anything you have already ruled out. This is knowledge you have now and will lose, and it can save future you hours of re-investigation. A note like 'probably the save serializer, the timestamp field looks wrong, not the load path, I checked' hands future you a head start instead of making them start the investigation from zero.

The payoff of all this is compounding: every bug you document well is a bug future you can pick up and act on immediately, instead of having to re-derive everything first. For a solo or small-team developer working through a backlog over months, that difference, between bugs you can resume cold and bugs you have to re-investigate from scratch, is enormous. Documenting bugs for future you is one of the highest-return habits in long-running game development, because you are constantly handing work to a version of yourself who has forgotten how it got there.

Future you remembers nothing. Document the repro, the context, and your hunch while it's fresh, you're writing for a stranger who is you.