CTComments comments = sheetComments.getCTComments();
CTCommentList commentList = comments.getCommentList();
// Create 2 comments for A1 and A" cells
CTComment comment0 = commentList.insertNewComment(0);
comment0.setRef("A1");
CTRst ctrst0 = CTRst.Factory.newInstance();
ctrst0.setT(TEST_A1_TEXT);
comment0.setText(ctrst0);
CTComment comment1 = commentList.insertNewComment(0);