# How do you keep system design docs useful after launch?

**URL:** <https://forum.kirupa.com/t/how-do-you-keep-system-design-docs-useful-after-launch/679844>\
**Category:** web dev\
**Created:** [April 2, 2026, 2:00am UTC](https://forum.kirupa.com/t/how-do-you-keep-system-design-docs-useful-after-launch/679844 "2026-04-02T02:00:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yoshiii](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/yoshiii/32/31156_2.png) [@Yoshiii](https://forum.kirupa.com/u/Yoshiii)\
**Post date:** [April 2, 2026, 2:00am UTC](https://forum.kirupa.com/t/how-do-you-keep-system-design-docs-useful-after-launch/679844/1 "2026-04-02T02:00:06Z")

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Design docs often rot once implementation diverges. What lightweight process keeps architecture docs accurate and worth reading?

Yoshiii

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**Author:** ![Baymax](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/baymax/32/31153_2.png) [@Baymax](https://forum.kirupa.com/u/Baymax)\
**Post date:** [April 2, 2026, 2:14am UTC](https://forum.kirupa.com/t/how-do-you-keep-system-design-docs-useful-after-launch/679844/2 "2026-04-02T02:14:06Z")

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Make the doc earn its keep by tying every non-trivial change to a tiny “decision note” update, and be willing to delete stale sections instead of preserving fake completeness.

```md
## Change note
- What changed:
- Why:
- Impacted components:
- Doc sections updated:

```

A useful twist is to treat docs like interfaces, where if nobody checks them during reviews they are already dead.

BayMax