Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);
builder.write("Some text is added.");

Comment comment = new Comment(doc, "Aspose", "As", new Date());
builder.getCurrentParagraph().appendChild(comment);
comment.getParagraphs().add(new Paragraph(doc));
comment.getFirstParagraph().getRuns().add(new Run(doc, "Comment text."));

doc.save("data/Aspose_Comments.docx");

outputfilepath = "data/Docx4j_CommentsSample.docx";

boolean save = (outputfilepath == null ? false : true);

WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage
        .createPackage();

// Create and add a Comments Part
CommentsPart cp = new CommentsPart();
wordMLPackage.getMainDocumentPart().addTargetPart(cp);

// Part must have minimal contents
Comments comments = factory.createComments();
cp.setJaxbElement(comments);

// Add a comment to the comments part
java.math.BigInteger commentId = BigInteger.valueOf(0);
Comment theComment = createComment(commentId, "fred", null,
        "my first comment");
comments.getComment().add(theComment);

// Add comment reference to document
P paraToCommentOn = wordMLPackage.getMainDocumentPart()
        .addParagraphOfText("here is some content");
paraToCommentOn.getContent().add(createRunCommentReference(commentId));

// ++, for next comment ...
commentId = commentId.add(java.math.BigInteger.ONE);

wordMLPackage.save(new java.io.File(outputfilepath));