diff --git a/dynamic_programming/climbing_stairs.py b/dynamic_programming/climbing_stairs.py
index d6273d025f08..30f137036806 100644
--- a/dynamic_programming/climbing_stairs.py
+++ b/dynamic_programming/climbing_stairs.py
@@ -3,7 +3,7 @@
 
 def climb_stairs(number_of_steps: int) -> int:
     """
-    LeetCdoe No.70: Climbing Stairs
+    LeetCode No.70: Climbing Stairs
     Distinct ways to climb a number_of_steps staircase where each time you can either
     climb 1 or 2 steps.
 
diff --git a/sorts/merge_sort.py b/sorts/merge_sort.py
index 0628b848b794..ec2210205b1d 100644
--- a/sorts/merge_sort.py
+++ b/sorts/merge_sort.py
@@ -26,6 +26,8 @@ def merge_sort(collection: list) -> list:
     []
     >>> merge_sort([-2, -5, -45])
     [-45, -5, -2]
+    >>> merge_sort([90,-90,2,15,39,-54,0])
+    [-90,-54,0,2,15,39,90]
     """
 
     def merge(left: list, right: list) -> list: