I can't find any documentation about the heatsink

I’m interested in purchasing a Bpi R4 Lite for a project, but I see that the documentation regarding the heat sink is lacking. I’ve searched and can’t find any references to it. I see that they don’t sell an official heat sink for the board. Could someone from the team help me with this?

BPI-R4 Lite have official heat sink , you can contact [email protected] ask support