Google Docs is an excellent alternative to many other word processing applications, and it allows users to communicate with collaborators about specific parts of a document without having to send an email or message them. Here’s how you can add comments in Google Docs.
Adding comments in Google Docs is a useful way to add notes, suggestions, or questions for other collaborators in the document. Comments are an excellent way for teachers to add specific notes for the author/student who wrote the file. Adding comments is also available for Slides and Sheets and is virtually the same, but we will be using Docs in our examples below.
Note: To add and reply to comments, you first need to have edit/comment access to the document.
RELATED: How to Create Shareable Download Links for Files on Google Drive
How to Add Comments in Google Docs
In a document on which you have editing or commenting rights, highlight or place your cursor next to the text, image, cell, or slide to which you want to add a comment. Click either the comment icon in the toolbar or the one that appears on the righthand side of the document.
A comment box opens up. Type in your comment and then click “Comment” to submit your notes.
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Source: How-To Geek