export from module

Here is a code taken from http://www.angelfire.com/tx4/cus/shapes/haskell98.html . It compiles and executes correctly in WinGHCi if I comment the names in the module header. But if the names are kept then it does not compile - it reports an error on the name MakeCircle. My question is: if I want to explicitly mention that I want to export MakeCircle, what code changes are required?

module Circle -- (Circle, MakeCircle, getRadius, setRadius)
  where
  import Shape

  class Shape a => Circle a where
      getRadius :: a -> Int
      setRadius :: a -> Int -> a

  instance Shape CircleInstance where
      getX = x
      getY = y
      setX a newx = a {x = newx}
      setY a newy = a {y = newy}
      moveTo a newx newy = a {x = newx, y = newy}
      rMoveTo a deltax deltay = a {x = ((getX a) + deltax), y = ((getY a) + deltay)}
      draw a =
         putStrLn ("Drawing a Circle at:(" ++ (show (getX a)) ++ "," ++ (show (getY a)) ++
            "), radius " ++ (show (getRadius a)))

   instance Circle CircleInstance where
      getRadius = radius
      setRadius a newradius = a {radius = newradius}

   data CircleInstance = MakeCircle {x, y, radius :: Int}
      deriving(Eq, Show)