You can also add notes to articles. You can add notes within any section of the document itself, as well as add general notes referring the document as a whole.
Add a Note to a Specific Section
To annotate a specific section of an article, right click at the place in the article where you would like your note to appear. Click on the icon that says "Sticky Note." Enter the your text and click anywhere else on the screen. You will see that your note has been replaced by a small yellow icon. Click on that icon again to view the text of your note.
Add A Note on the Document as a Whole
To add notes about the article as a whole, click on the "Info" icon at the top right. Then click on "Annotations" at the top of the panel that appears. Add your notes to the section labeled "General Notes."
View All Notes
You may all the notes that you have added to an article at the same time. Click on the “Annotations” tab on the right panel. Underneath the text box for general notes, you will see a list of all the notes you made within the document. If you click on one of those notes, it will jump to the place in the document where your note appears.