diff --git a/.github/workflows/python-tests.yml b/.github/workflows/python-tests.yml
new file mode 100644
index 0000000..e69de29
diff --git a/main.py b/main.py
index 8d0b480..7af49ee 100644
--- a/main.py
+++ b/main.py
@@ -2,7 +2,7 @@ class Calculator:
     """A simple calculator with basic arithmetic operations."""
 
     def add(self, a, b):
-        return a + b
+        return a - b
 
     def subtract(self, a, b):
         return a - b