diff --git a/example.py b/example.py
index d26c40a62b5ac65a764e707968a8f286bcd01a02..f8f59cb2e60dbf321c868ae9b07c49e7d0b905c8 100644
--- a/example.py
+++ b/example.py
@@ -12,5 +12,5 @@ def subtract(a, b):
 
 
 # uncomment the following test in step 5
-#def test_subtract():
-#    assert subtract(2, 3) == -1
+def test_subtract():
+    assert subtract(2, 3) == -1