I've been trying to search for an answer, but I think that having the words PowerShell and parameter together in a set of keywords are not making for an easy search

My question is, I'm writing a function, and I've supplied a parameter, but the parameter has to be one of a list of specific strings.

Is there a way I can supply these strings within the script so that if I type "myfunction -parameter .." I can use tab completion for the parameter value?