diff --git a/README.md b/README.md
index 828cb57..9272828 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,5 @@
 - Circle: P = 2πR
 - Rectangle: P = 2a + 2b
 - Square: P = 4a
+ 
+### This is my change.
\ No newline at end of file
diff --git a/circle.py b/circle.py
index 21e9a17..294e013 100644
--- a/circle.py
+++ b/circle.py
@@ -7,3 +7,5 @@ def area(r):
 
 def perimeter(r):
     return 2 * math.pi * r
+
+print(area(2), perimeter(2))
diff --git a/square.py b/square.py
index c782610..1a44795 100644
--- a/square.py
+++ b/square.py
@@ -4,3 +4,5 @@ def area(a):
 
 def perimeter(a):
     return 4 * a
+
+print(area(2), perimeter(2))
\ No newline at end of file