Docs feedback: Confusing sentence on Runner Docker page

https://docs.gitlab.com/runner/executors/docker.html#workflow

The bolded text is what is confusing. Instead should it have stated "to run the prepare step FOR the build"? or something else?

The special Docker Image is based on Alpine Linux and contains all the tools required to run the prepare step the build: the Git binary and the Runner binary for supporting caching and artifacts.