diff --git a/README.md b/README.md
index d0bb3a0..6bb772b 100644
--- a/README.md
+++ b/README.md
@@ -1238,9 +1238,9 @@ from itertools import *
  ('b', 'a'), ('b', 'c'), 
  ('c', 'a'), ('c', 'b')]
 
->>> product('ab', [1, 2])
-[('a', 1), ('a', 2), 
- ('b', 1), ('b', 2)]
+>>> product('ab', '12')
+[('a', '1'), ('a', '2'),
+ ('b', '1'), ('b', '2')]
 
 >>> product([0, 1], repeat=3)
 [(0, 0, 0), (0, 0, 1), (0, 1, 0), (0, 1, 1),