knights and knaves riddle?

[KaraKamdon]

knights always tell the truth and knaves always lie.
you meet to inhabitants: peggy and zippy. peggy tells you of zippy and i exactly one knight. zippy tells you only a knave would say that peggy is a knave can you tell who is a knight and who is a knave ? why

 

[Bryan]

tell a riddle that makes sense and i'll solve that one for ya