Improve language on Edit Room Assignment

The Info for the Edit Room Assignment (Online/PE) says "To assign a PRIMARY room (optional) to staff member select icon while hovering over the room name. ADDITIONAL rooms can be assigned by selecting checkboxes."

Could this please be updated to tell the clients that adding the blue checkmark gives permission to see the messages in addition to the assigned room? This is not clear and that info is not intuitive, or really shown anywhere else.

Please make the language clear what this actually does. Thank you.