P2 Propellertool crystal<>20Mhz

pic18f2550

Hello,
the propellertool can calculate the configuration of the corresponding registers from a frequency value.
But the calculations always assume a crystal frequency of 20Mhz.
But I want to have 16Mhz as base where can I change this?

ManAtWork

Just put

CON
  _xtlfreq = 16_000_000
  _clkfreq = 256_000_000

somewhere in you main object