Whenever you spot some minor issue in your teammate’s code, want to post a reminder note, or start an informal discussion - you can leave comments without creating a review.
You can post comments, addressing them to the revision author and other participants, and reply to the comments left by others. There are three types of comments:
Revision comment is not tied up to any particular file or part of code - its subject matter may be anything within the scope of the revision.
Code selection comment is intended to pinpoint a particular code fragment in one of the files in the revision.
Line comment is associated with a specific line of code.
Posted code selection comments and line comments are embedded in code and highlighted with yellow.
To post a revision comment, type your message in the text field at the bottom and click Add Comment:
To post a code selection comment:
Open the file and go Side-by-side diff or View file.
Select the lines you want to discuss and choose Comment on selection from the pop-up menu.
Type in your message and click Add Comment:
To post a line comment:
In the revision home view, expand the file and select the line you want to comment on by clicking the edit icon to the left:
Enter your message in the text box and click Add comment:
When a discussion thread comes to a logical end, either you or the revision author can mark it as resolved.
Note: If the revision you’re commenting is covered by a review, you may choose to include your comments into that review.