diff --git a/sorts/bubble_sort.py b/sorts/bubble_sort.py
index 9ff987fa9..e17fc3358 100644
--- a/sorts/bubble_sort.py
+++ b/sorts/bubble_sort.py
@@ -17,6 +17,9 @@ def bubble_sort(collection):
 
     >>> bubble_sort([-2, -5, -45])
     [-45, -5, -2]
+    
+    >>> bubble_sort([-23,0,6,-4,34])
+    [-23,-4,0,6,34]
     """
     length = len(collection)
     for i in range(length-1):