diff --git a/new_file.py b/new_file.py
index 3025283..51bd8d2 100644
--- a/new_file.py
+++ b/new_file.py
@@ -1,2 +1,5 @@
 def my_sum(a, b):
     return a + b
+
+def my_diff(a, b):
+    return a - b