In this tutorial the instructor shows how to use commenting tools in Adobe Acrobat 9. He says that the look and feel of the commenting tools are very similar to the previous version tools which were used to mark and comment documents. He shows how to open the comment button from the menu bar and explains about the options present in there to use the commenting features. He demonstrates many ways to enable comments and markup tool bar in the application. Now he shows about the various ways of how to add, edit and modify those comments. This video discusses about the comments feature of Adobe Acrobat 9 and demonstrates it with examples.