diff --git a/python_3_oop/chapter03/duck_typing_wikipedia.py b/python_3_oop/chapter03/duck_typing_wikipedia.py
index 7a79ca2..3678c80 100644
--- a/python_3_oop/chapter03/duck_typing_wikipedia.py
+++ b/python_3_oop/chapter03/duck_typing_wikipedia.py
@@ -21,6 +21,7 @@ class Duck(Bird):
 
 class Frog:
     "Frogs also can quak"
+
     def quak(self):
         print(str(self)+': quak')