Cruise Control

I have found myself changing gears (of my manual transmission) while on cruise control without touching the gas pedal. Example: cruising along at 45 mph in 5th gear approaching an uphill. Push clutch down (ends cruise control), shift to 4th, let clutch out, hit the resume button on the cruise control. Vice versa, 4th to 5th, works just as well. I hardly change speed and there are no jerky motions.