What is the improvement or update you wish to see?

When following the docs to add turborepo to an existing repository, the first step is to run
pnpm add turbo --save-dev --workspace-root

I ran that, but the command failed because I did not have an existing pnpm-workspace.yaml file. I understand this is likely trivial, but may be worth it to add a note, or pre-requisite that states you need that file set up.

 pnpm add turbo --save-dev --workspace-root
 ERROR  --workspace-root may only be used inside a workspace

Is there any context that might help us understand?

See above, pretty straightforward.

Does the docs page already exist? Please link to it.

https://turbo.build/repo/docs/getting-started/add-to-existing-repository#adding-turborepo-to-your-repository