specific sensors directions

I am trying to get sensors working. I ran sensors-detect, followed all steps, up to the point where it directs to add modprobe lines to "...some /etc/rc* file." Howto directions in other places say to add lines "...to the appropriate /etc/rc.d/xxxx file." Can someone be a little more specific about the file to add these lines to? What may be appropriate to someone wiser is not so obvious to me. Thanks for your assistance. Richard