Quick help continuing a curve once finished

Rhino Rhino for Mac
1

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

2

ContinueCurve or ContinueInterpCrv

3

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

Max.

4

Extend curve ??

5

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