An undocumented design system is a half-finished one. If people cannot find what exists or learn how to use it, they reinvent it and consistency erodes. Documentation is what turns a pile of CSS into a system a team actually adopts.
Document the tokens
A token reference shows every colour, spacing step, type size and radius with its name, value and intended use. When developers can look up "the accent colour token" instead of guessing a hex, the system stays consistent.
Document each component
For each component, show what it looks like, the classes to use, its variants and states, and — crucially — when to use it and when not to. A live example plus the markup is worth a thousand words of prose.
Do and don't examples
The most effective docs pair correct usage with common misuse: "do use the primary button for the main action; don't use two primary buttons in one view". Concrete do/don't pairs prevent the mistakes that erode a system faster than any rule.
Design-to-development handoff
Documentation is also the contract between design and engineering. When designers and developers share the same token names and component definitions, handoff stops being translation and becomes a shared language. A token called <code>--color-accent</code> means the same thing in the design tool and the code.
/* ship components, skip docs *//* ship components with token reference, usage and do/don't */Building a great system and leaving it undocumented, so teammates cannot find or trust it and build their own parallel styles. Docs are part of the deliverable, not an afterthought.
Document tokens, components (with live examples and markup), and do/don't usage, and align the names with design. Keep docs living — next to the code so they stay current. Documentation is what makes a system get adopted.
Write a one-page doc for the mini design system you built: list the tokens with values and use, show one component with its markup and variants, and add one do/don't pair.
1. Why document a design system?
2. What makes component docs most useful?
3. Shared token names between design and code…
- Document tokens, components and do/don't usage — docs drive adoption.
- Live examples with markup beat long prose.
- Align token and component names with design for smooth handoff.
- Keep docs living, next to the code, so they stay current.