diff --git a/calculator/calculator.py b/calculator/calculator.py
index 7f593f2..ca17216 100644
--- a/calculator/calculator.py
+++ b/calculator/calculator.py
@@ -4,4 +4,8 @@ def add(x,y):
 
 def subtract(x,y):
     """Subtract one number from another."""
-    return x - y
\ No newline at end of file
+    return x - y
+
+def multiply(x,y):
+    """Multiply two numbers."""
+    return x * y
\ No newline at end of file
diff --git a/tests/test_calculator.py b/tests/test_calculator.py
index 819b962..fc101ca 100644
--- a/tests/test_calculator.py
+++ b/tests/test_calculator.py
@@ -1,5 +1,5 @@
 import unittest
-from calculator.calculator import add, subtract
+from calculator.calculator import add, subtract, multiply
 
 class TestCalculator(unittest.TestCase):
 
@@ -9,5 +9,8 @@ def test_add(self):
     def test_subtract(self):
         self.assertEqual(subtract(5, 3), 2)
 
+    def test_multiply(self):
+        self.assertEqual(multiply(3, 4), 12)
+
 if __name__=='__main__':
     unittest.main()
\ No newline at end of file