diff --git a/buggy_binary_search.py b/buggy_binary_search.py
new file mode 100644
index 0000000..6642b48
--- /dev/null
+++ b/buggy_binary_search.py
@@ -0,0 +1,13 @@
+def binary_search(arr, target):
+    left, right = 0, len(arr) - 1  # Bug fixed: use len(arr) - 1
+    while left <= right:
+        mid = (left + right) // 2
+        if arr[mid] == target:
+            return mid
+        elif arr[mid] < target:
+            left = mid + 1
+        else:
+            right = mid - 1
+    return -1
+
+print(binary_search([1, 2, 3, 4, 5], 3))