Heater 2 pin to power additional fan

Hey all,

I'm trying to hook up the stepper driver cooling fans to the He2 output on the RUMBA. I'm completely new to this and I need help.

I'm using a RUMBA control board, and Marlin firmware. Single extruder connected to the extruder 0 pins.

In configuration_adv.h I found some code as follows:
#define CONTROLLERFAN_PIN -1 //Pin used for the fan to cool controller (-1 to disable)
#define CONTROLLERFAN_SECS 60 //How many seconds, after all motors were disabled, the fan should run
#define CONTROLLERFAN_SPEED 255 // == full speed

And in pins_RUMBA.h I found this:
#define HEATER_2_PIN 6 // EXTRUDER 3

I'm guessing if I change the value from -1 to 6 in #define controllerfan_pin, the fans should work. I'm just guessing though so I'm a little afraid to test it. Saved up for a while to buy the parts and don't want to fry the board before I begin playing with it :)

Any ideas?

Thanks, and regards!