diff --git a/articles/binary-search.md b/articles/binary-search.md
index 5e88782ce..bfc872a8a 100644
--- a/articles/binary-search.md
+++ b/articles/binary-search.md
@@ -312,7 +312,7 @@ class Solution {
 ```python
 class Solution:
     def search(self, nums: List[int], target: int) -> int:
-        l, r = 0, len(nums)
+        l, r = 0, len(nums) -1
 
         while l < r:
             m = l + ((r - l) // 2)  
@@ -455,7 +455,7 @@ class Solution {
 ```python
 class Solution:
     def search(self, nums: List[int], target: int) -> int:
-        l, r = 0, len(nums)
+        l, r = 0, len(nums) -1
 
         while l < r:
             m = l + ((r - l) // 2)  
@@ -669,4 +669,4 @@ class Solution {
 ### Time & Space Complexity
 
 * Time complexity: $O(\log n)$
-* Space complexity: $O(1)$
\ No newline at end of file
+* Space complexity: $O(1)$