diff --git a/uebung_05/exercise_03/.exercise_03.py.swp b/uebung_05/exercise_03/.exercise_03.py.swp
deleted file mode 100644
index 06bd1b1..0000000
Binary files a/uebung_05/exercise_03/.exercise_03.py.swp and /dev/null differ
diff --git a/uebung_05/exercise_03/exercise_03.py b/uebung_05/exercise_03/exercise_03.py
index 53fcd5e..5f771c3 100644
--- a/uebung_05/exercise_03/exercise_03.py
+++ b/uebung_05/exercise_03/exercise_03.py
@@ -16,9 +16,6 @@ class Point:
         return Point(-self.__x__, -self.__y__)
 
     def __add__(self, other):
-        x = 0.0
-        y = 0.0
-
         if isinstance(other, Point):
             return Point(self.__x__ + other.__x__, self.__y__ + other.__y__)
         elif isinstance(other, int) or isinstance(other, float):
@@ -30,10 +27,7 @@ class Point:
         return self + other
 
     def __sub__(self, other):
-        if isinstance(other, Point) or isinstance(other, int) or isinstance(other, float):
-            return self + (-other)
-        else:
-            raise ValueError("Operand must be Point, int or float.")
+        return self + (-other)
 
     def __rsub__(self, other):
         return self - other
@@ -66,14 +60,15 @@ p3 = Point (3, 2)
 p4 = 2 * p2 + p3 - 1
 p5 = p4.rot(math.pi / 2)
 
-plt.plot(p1.get_x(), p1.get_y(), "orange", marker = "o")
-plt.plot(p2.get_x(), p2.get_y(), "green", marker = "o")
-plt.plot(p3.get_x(), p3.get_y(), "yellow", marker = "o")
-plt.plot(p4.get_x(), p4.get_y(), "purple", marker = "o")
-plt.plot(p5.get_x(), p5.get_y(), "purple", marker = "o")
+plt.plot(p1.get_x(), p1.get_y(), "orange", marker = "o", label = p1)
+plt.plot(p2.get_x(), p2.get_y(), "green", marker = "o", label = p2)
+plt.plot(p3.get_x(), p3.get_y(), "yellow", marker = "o", label = p3)
+plt.plot(p4.get_x(), p4.get_y(), "purple", marker = "o", label = 2 * p2 + p3 - 1)
+plt.plot(p5.get_x(), p5.get_y(), "purple", marker = "o", label = f"{p4} rotated 90°")
 
 plt.title("Points")
 plt.xlabel("x")
 plt.ylabel("y")
+plt.legend()
 
 plt.show()