No. The function is pretty self explanatory. But here is some documentation
What it does: sets the transmit/receive frequency of the radio module. The parameter is in Hz. For 915mhz you would pass 915000000. Note that setting a 433mhz module for instance to 915mhz would work but it would grossly underperform since it is hardware conditioned to bandpass only the 433mhz frequencies, and attenuate other frequencies. Hence, try to keep in band with the module's
intended frequency range.