Commenting
You can comment on pull requests and proposed changes (commits) that other users make. When you comment on a commit, you view a source diff of the file, and you then you can comment on specific changes on a line-by-line basis or on the entire commit. You also can make suggestions about an overall project, by submitting an Issue or commenting on an existing Issue.
Review and comment on a pull request:
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In your browser, navigate to the applicable repo on GitHub.
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Click Pull requests n, where n is the number of active pull requests.
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Select the pull request that you want to review, and then on the Write tab, in the Leave a comment text box, input your comment.
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Click Comment.
Review and comment on a commit:
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In your browser, navigate to the applicable repo on GitHub.
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Click n commits**, where **n* is the number of commits that have been submitted. If you want to review the latest commit, you can select the title/short description of the commit from file list.
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In the source diff section, select the change on which you want to comment by clicking the plus sign (+) that appears when the mouse hovers over the applicable change.
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On the Write tab, in the Comment text box, provide your comment.
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Click Comment.
Note: If you wish to provide an overall comment on the commit, under n comments on commit, where n is the number of comments submitted, and then under the Write tab, in the Leave a comment text box, type your comment, and Click Comment on this commit.