Updated Appendix A: Printed circuit boards (markdown)

Appendix-A:-Printed-circuit-boards.md

@@ -5,7 +5,7 @@ Getting the Ploopy Mouse boards made can be complex, and expensive, especially i
 
 - You get a base PCB with all components soldered
 - You get a vertical PCB with all components soldered
-- The firmware is already programmed on the microcontroller
+- The firmware is already programmed on the microcontroller, so you won't need an Arduino Nano
 - It'll cost a hell of a lot less than if you do a production run of PCBs just for yourself
 - You won't have to order components and wait while they come in
 - We guarantee that it works