Legacy Peripheral definitions missing

Hi,
 
I'm using MPLAB X v5.05 with the legacy peripheral libraries and my MCU is the PIC32MX795F512L.
Everything is working fine but I have a problem with some functions from the libraries.
For example in CAN.h:
 
void CANAssignMemoryBuffer(CAN_MODULE module, void * buffer, UINT sizeInBytes);
 
I'm not able to go to the definition of that declaration and often I want to see what the library function is actually doing, I think I'm missing something here.
 
Thanks in advance!
t b