Thanks for your reply
The document is just plain text without table/image... so I would say the layout won't change when it is viewed on a different PC with a different machine. Leaving comment is only one of the ways I am thinking to notify users the findings and msgbox could do the job which will not affect the text flow ?
Because the document contains about 100 pages (all text), so I just want to check whether sometimes the first line of any pages is empty, so that I can make amendments to delete that line and make the document to be more tidy.