Multiple requirements file in dependabot

I have multiple requirements file - requirements.txt, requirements_test.txt and requirements_docs.txt.

I know that the code below searches for requiremnts.txt and updates it.

version: 2
  - package-ecosystem: "pip"
    directory: "/"
      interval: "daily"

I wonder if it also updates other requirements file too? If not is there a way to specify the files names to look for?