Bitrise CLI - how does PR mode works?

bitrise-cli
#1

Bitrise CLI help includes some --pr mode. But it seems I can’t find any details how to launch cli in that mode. I have set trigger for pull requests on master branch, to launch specific workflow that checks project build successfully. How I can launch cli to wait for pull requests? Does -pr mode is about it?

trigger_map:
- pull_request_target_branch: master
  workflow: build-dev
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