diff --git a/array/three_sum.py b/array/three_sum.py
index 4b5753347..e5486cf93 100644
--- a/array/three_sum.py
+++ b/array/three_sum.py
@@ -3,7 +3,7 @@
 such that a + b + c = 0?
 Find all unique triplets in the array which gives the sum of zero.
 
-Note: The solution set must not contain duplicate triplets.
+Note: The solution set must not    contain duplicate triplets.
 
 For example, given array S = [-1, 0, 1, 2, -1, -4],