diff --git a/sorts/shell_sort.py b/sorts/shell_sort.py
index 4dc37240b9db..c87651662de9 100644
--- a/sorts/shell_sort.py
+++ b/sorts/shell_sort.py
@@ -18,7 +18,7 @@ def shell_sort(collection):
comparable items inside
:return: the same collection ordered by ascending
- >>> shell_sort([0, 5, 3, 2, 2)]
+ >>> shell_sort([0, 5, 3, 2, 2])
[0, 2, 2, 3, 5]
>>> shell_sort([])