Share and collaborate
3. Add comments and replies
- In Docs, Sheets, or Slides, select the text you'd like to comment on.
- Click Comment
> Add comment 
.
- Enter your comment in the box.
- (Optional) To direct your task or comment to a specific person,
enter a plus sign (+) followed by their email address. You can add as
many people as you want. Each person will get an email with your comment
and a link to the file.
- (Optional) To assign the comment to a specific person, check the Assign to box.
- Click Comment or Assign.