1. In 'Reservation view' you can be in either 'Edit' or 'View' mode.
2. Find the room were you want to add the comment, click '+' icon by 'Comments' header.
3. Fill in comment and click done, the comment will now appear below 'Comments' header by the room. The comment will be saved after you press 'Done'
4. This comment will be visible in the reservation and in arrival and departure list by the room it is connected to.
5. When rooms are minimized by the "Collapse" arrows you will be able to see that there is comments on the room by the "speech bubble" icon.