Technical Documentation: Why Code Repositories Are the Best Wikis

The Problem with Outdated Wikis

Developer documentation stored in external wikis (like Confluence or Notion) quickly becomes outdated. This happens because documentation updates are separated from codebase changes, leading to outdated deployment steps and config keys.

Case Study: Onboarding Starvation

A tech team spent 3 weeks helping a new developer configure their local dev environment. The wiki guides reference old environment keys and dependencies that were replaced months prior.

The Bug: Decoupled Documentation Lifecycles

Because documentation was stored in a separate system, developers pushed code changes without updating the wiki. Over time, the gap between documentation and actual system state widened.

The Fix: Documentation as Code

We migrated all documentation to Markdown files inside the project’s code repository. We also configured a documentation linting step in the CI pipeline:

# Example project structure
/docs
  - local-setup.md
  - api-reference.md
  - deployment-runbook.md
README.md

Documentation updates are now required in the same pull requests that modify configuration settings. This ensures guides stay updated alongside codebase changes.