diff --git a/data_structures/stacks/balanced_parentheses.py b/data_structures/stacks/balanced_parentheses.py
index 928815bb2..a4f532641 100644
--- a/data_structures/stacks/balanced_parentheses.py
+++ b/data_structures/stacks/balanced_parentheses.py
@@ -9,8 +9,12 @@ def balanced_parentheses(parentheses: str) -> bool:
     True
     >>> balanced_parentheses("[(])")
     False
-    >>> balanced_parentheses("1+2*3-4")
+    >>> balanced_parentheses("{}")
     True
+    >>> balanced_parentheses("))((")
+    False
+    >>> balanced_parentheses("((")
+    False
     >>> balanced_parentheses("")
     True
     """