Good design system documentation covers several layers of content, and when you get them all right, every team member can build consistent, accessible products without constantly pinging someone for answers.

1. Design principles and brand guidelines: Start here. What values are driving the design decisions? What does the brand actually sound like? Teams need this context to make judgment calls when they hit edge cases, which they will.

2. Design tokens: Document every base-level variable: color palettes, typography, spacing scales, border radius values, shadow levels, animation timing. These are the raw material everything else is built from.

3. Component library: Every component (buttons, inputs, checkboxes, dropdowns, modals, tooltips, cards) needs its own page covering visual previews, variants and states, usage guidelines, code examples, and accessibility requirements. No shortcuts here.

4. Patterns and page templates: Document higher-level UX patterns that combine multiple components: data tables with pagination, empty states, error pages, onboarding flows, form layouts. Individual components are fine; knowing how they fit together is what actually speeds teams up.

5. Content and writing guidelines: Tone of voice, grammar conventions, error message writing, button label standards, microcopy. Language consistency matters as much as visual consistency, and it's usually the first thing that gets skipped.

6. Accessibility standards: Spell out what the system targets, such as WCAG 2.1 AA compliance, and explain specifically how each component meets those standards. Developers need to know what they're responsible for implementing correctly.

7. Contribution and governance guidelines: How do you propose a new component? Report a bug? Who reviews changes? How are versioning and deprecations handled? Without clear answers, the documentation quietly goes stale.

8. Changelog and versioning: Keep a transparent record of changes, updates, and breaking modifications. Teams need to know what changed and when so they can plan upgrades instead of discovering surprises in production.

Get all of this right and