Quick help continuing a curve once finished

I can’t recall the command to continue a finished curve of 3rd degree. or any other degree for that matter.

ContinueCurve or ContinueInterpCrv

ContinueCurve (control points curve) or ContinueInterpCrv (curve through points).


Extend curve ??

Thank you all for the replies!
Continue curve was it!
Thank you @rhinorudi for extend curve as well.