How to: Programmatically Add Comments to Text in Documents
The Comments property of the Document class adds a comment to a range of text in a Microsoft Office Word document.
Applies to: The information in this topic applies to document-level projects and application-level projects for Word 2013 and Word 2010. For more information, see Features Available by Office Application and Project Type.
The following example adds a comment to the first paragraph in the document.
To add a new comment to text in a document-level customization
To add a new comment to text in an application-level add-in
To change the user initials that Word adds to comments, use the UserInitials property.