diff --git a/lab2/fern/fern.hs b/lab2/fern/fern.hs
index 60308b7..b348f84 100644
--- a/lab2/fern/fern.hs
+++ b/lab2/fern/fern.hs
@@ -14,7 +14,7 @@ transformation3 (x, y) = (0.2 * x - 0.26 * y, 0.23 * x + 0.22 * y + 1.6)
 transformation4 :: Point -> Point
 transformation4 (x, y) = (-0.15 * x + 0.28 * y, 0.26 * x + 0.24 * y + 0.44)
 
-applyTransformation :: (Ord a, Fractional a) => Point -> a -> Point
+applyTransformation :: Point -> Float -> Point
 applyTransformation point random
   | random < 0.01 = transformation1 point
   | random < 0.86 = transformation2 point
@@ -28,10 +28,10 @@ genNextPoint point = do
 
 barnsleyFern :: Point -> Int -> IO [Point]
 barnsleyFern _ 0 = return []
-barnsleyFern start n = do
-  x' <- genNextPoint start
+barnsleyFern startPoint n = do
+  x' <- genNextPoint startPoint
   xs <- barnsleyFern x' (n - 1)
-  return (start : xs)
+  return (startPoint : xs)
 
 main :: IO ()
 main = do