State the scope, the non-scope and the key point at the start

Google's course says a good document begins by defining its scope, and a better one also defines its non-scope: topics the reader might expect but that the document will not cover. It also suggests a blunt test: imagine your peers might only read the first paragraph.

So the opening of any document should answer:

• What is this? One sentence.
• Who is it for? Roles and prerequisites.
• What is not covered? And where to find it.
• What is the main point or ask?

This page explains how to rotate the payments API keys.
For: on-call engineers with production access.
Not covered: creating new API clients (see "Onboarding a client").
Rotation takes about 15 minutes and needs no downtime.