Google’s latest update makes it simpler to comment on your own or your colleagues’ Docs, Sheets, and Slides files on both the web and mobile platforms. Now, if you highlight some content, an icon appears at the right-hand page edge:
Clicking on the icon allows you to add a comment to that area of the document.
If you start typing someone’s name or email address in a comment, a list of suggested contacts will appear from which you can select the appropriate entry:
Not a major change, but useful nonetheless.