diff --git a/data_structures/stacks/balanced_parentheses.py b/data_structures/stacks/balanced_parentheses.py
index 8d99358be..02efa8980 100644
--- a/data_structures/stacks/balanced_parentheses.py
+++ b/data_structures/stacks/balanced_parentheses.py
@@ -6,7 +6,7 @@ __author__ = 'Omkar Pathak'
 
 
 def balanced_parentheses(parentheses):
-    """ Use a stack to check if a string of parentheses are balanced."""
+    """ Use a stack to check if a string of parentheses is balanced."""
     stack = Stack(len(parentheses))
     for parenthesis in parentheses:
         if parenthesis == '(':