When I turn the ignition key, the car starts but sound the horn once. Anyone figure out why? and how to fix it

 

turn ignition key , starter engages , engine starts , horn beeps once
are you touching steering wheel when turning key?
work on anything around steering column lately ?
weird occurance so am asking qestions. more info may help.

 

No touching anything when turn the ignition key. No been working around the steering wheel, but the battery has been replaced. Is it possible the ignition key switch wiring related to the horn wiring??