diff --git a/1 Two Sum b/1 Two Sum.cpp
similarity index 70%
rename from 1 Two Sum
rename to 1 Two Sum.cpp
index 0bb3d91..285a714 100644
--- a/1 Two Sum	
+++ b/1 Two Sum.cpp	
@@ -1,10 +1,10 @@
-1. Two Sum
+//1. Two Sum
 
-Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
+//Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
 
-You may assume that each input would have exactly one solution, and you may not use the same element twice.
+//You may assume that each input would have exactly one solution, and you may not use the same element twice.
 
-You can return the answer in any order.
+//You can return the answer in any order.
 
 //Optimal solution using HashMap