Documentation Coverage
Also known as: Docs Coverage, Knowledge Base Coverage
The percentage of product features, workflows, and common questions that have corresponding documentation articles.
Definition
Documentation coverage is a metric measuring what percentage of your product's features, workflows, integrations, and frequently-asked questions have corresponding documentation articles. Coverage at 100% means every feature has docs; coverage at 60% means 40% of the product is undocumented and users can't self-serve answers about it.
Coverage is typically tracked along multiple dimensions: feature coverage (every product feature documented), workflow coverage (every common user task documented), integration coverage (every supported integration documented), and FAQ coverage (top user questions answered). Each dimension produces a separate coverage percentage.
Coverage gaps are the leading cause of preventable support ticket volume. If a feature isn't documented, users either guess (often wrong) or contact support. Tracking which support tickets stem from documentation gaps and prioritizing documentation work to close those gaps is one of the highest-leverage support investments.
Why It Matters
Documentation coverage directly drives support ticket deflection. A product with 95% coverage typically sees 30-50% fewer tickets per user than a comparable product with 70% coverage. The math: every well-documented feature is a feature support doesn't have to explain repeatedly.
The biggest mistake is treating documentation as a one-time launch task rather than ongoing maintenance. New features ship constantly; without parallel documentation, coverage erodes monthly. Best-in-class teams treat documentation as a release requirement — no feature ships without docs.
Examples in Practice
A SaaS company audits documentation coverage quarterly: list every product feature, mark each as documented/undocumented/outdated. Current coverage: 78%. They prioritize the top 10 undocumented features by support ticket volume — within a quarter, coverage rises to 91% and tickets on those features drop 60%.
A B2B platform makes documentation a release requirement: every PR that adds a customer-facing feature must include corresponding docs PRs. Coverage stays above 95% perpetually because new gaps can't open without being noticed at code review.
An agency's client-facing knowledge base audits FAQ coverage by analyzing search-query logs for 'no result' queries. Each unanswered query becomes a candidate article. Within 6 months, search no-result rate drops from 22% to 8%.