Requesting a pull request review
After you create a pull request, you can ask a specific person to review the changes you've proposed. If you're an organization member, you can also request a specific team to review your changes.
Repository owners and collaborators can request a pull request review from anyone with read access to the repository. Organization members can also request a pull request review from teams with read access to the repository. The requested reviewer or team will receive a notification that you asked them to review the pull request.
Note: Pull request authors can't request reviews unless they are either a repository owner or collaborator with write access to the repository.
You can request a review from either a suggested or specific person. Suggested reviewers are based on git blame data. If you request a review, other people with read access to the repository can still review your pull request. If the requested reviewer does not submit a review, and the pull request meets the repository's mergeability requirements, you can still merge the pull request.
Under your repository name, click Pull requests.
In the list of pull requests, click the pull request that you'd like to ask a specific person or a team to review.
Navigate to Reviewers in the right sidebar.
To request a review from a suggested person under Reviewers, next to their username, click Request.
Optionally, to request a review from someone other than a suggested person, click Reviewers, then click on a name in the dropdown menu.
Optionally, if you know the name of the person or team you'd like a review from, click Reviewers, then type the username of the person or the name of the team you're asking to review your changes. Click their team name or username to request a review.