Plotting an oriented contour

I’d like to add at least one arrow to a closed contour in the plane to show that e.g. a circumference is counterclockwise oriented. If I use e.g.

ParametricPlot[ReIm[Exp[I t]], {t, 0, 2 \[Pi]}] 

how can I insert an option to add arrows along the circumference or other closed contour?