This article will help you to add comment for certain customer that need specific needs, for example the size, colour, payment, etc.
1. Go to Contact Menu - Choose Customer Name
2. After you click at the customer name - go to comment tab - click add button on the bottom left - insert the comment - click ok
3. This Comment is only for internal usage only so you can check it in contact menu for each comment that you have added
4. You can check by overall customer comment, go to Contact - More Menu - Comment
It will be shown like this