IT Documentation Best Practices: Writing Docs That Actually Get Read
IT documentation is universally acknowledged as important and universally neglected in practice. The gap between knowing documentation matters and actually having good documentation is bridged by treating documentation as a first-class deliverable — with the same discipline applied to code, infrastructure, and operations.
What to Document: Prioritizing by Impact
Document everything that would cause pain if the person with the knowledge left suddenly. The most critical documentation categories: runbooks for operational procedures (how to deploy, how to roll back, how to respond to alerts), architecture diagrams and network topology (what connects to what and why), access and credential inventory (who has access to what, where credentials are stored), incident post-mortems (what happened, why, and what changed), and on-boarding guides (what a new team member needs to become productive).
Do not document for documentation's sake. A wiki full of outdated, inaccurate documentation is worse than no documentation — it actively misleads. Prioritize quality and accuracy over volume.
Writing Documentation People Will Actually Read
Good IT documentation is structured for scanning, not reading cover-to-cover. Use headers, bullet points, numbered steps for procedures, code blocks for commands, and tables for comparisons. Front-load the most important information. Runbooks should open with what the procedure accomplishes and when to use it — not with a three-paragraph background section. Code snippets should be complete, copy-pasteable, and clearly marked with the expected environment and assumptions.
Assume the reader is competent but unfamiliar with this specific system or process. Avoid unexplained acronyms, undocumented prerequisites, and "obvious" steps that are obvious only to the person who wrote the documentation.
Keeping Documentation Current
Stale documentation is the norm because updating docs is not part of the natural work flow. Fix this structurally: require documentation updates as part of definition-of-done for changes, allocate specific time in each sprint or quarter for documentation review, use alerts to flag documents that have not been reviewed in a defined period, and tie runbook accuracy to incident retros (every time a runbook fails to address an actual incident scenario, update it before closing the incident).
Tools and Platforms
Confluence is the enterprise standard but its flexibility can lead to unstructured sprawl. Notion, Obsidian, and GitBook offer more modern alternatives. For operational runbooks, keeping them as Markdown files in a Git repository alongside the code they document ensures documentation changes are versioned, reviewed, and deployed together with the system changes they describe — the most reliable way to keep docs in sync with reality.
Explore our guides for documentation templates and runbook examples, or read our article on monitoring and observability.