diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md
index 7bada9af..56cff527 100644
--- a/problems/0001.两数之和.md
+++ b/problems/0001.两数之和.md
@@ -134,12 +134,13 @@ public int[] twoSum(int[] nums, int target) {
     }
     Map<Integer, Integer> map = new HashMap<>();
     for(int i = 0; i < nums.length; i++){
-        int temp = target - nums[i];
+        int temp = target - nums[i];   // 遍历当前元素，并在map中寻找是否有匹配的key
         if(map.containsKey(temp)){
             res[1] = i;
             res[0] = map.get(temp);
+            break;
         }
-        map.put(nums[i], i);
+        map.put(nums[i], i);    // 如果没找到匹配对，就把访问过的元素和下标加入到map中
     }
     return res;
 }
@@ -152,16 +153,17 @@ class Solution:
     def twoSum(self, nums: List[int], target: int) -> List[int]:
         records = dict()
 
-        for index, value in enumerate(nums):
-            if target - value in records:
+        for index, value in enumerate(nums):  
+            if target - value in records:   # 遍历当前元素，并在map中寻找是否有匹配的key
                 return [records[target- value], index]
-            records[value] = index
+            records[value] = index    # 遍历当前元素，并在map中寻找是否有匹配的key
         return []
 ```
 
 Go：
 
 ```go
+// 暴力解法
 func twoSum(nums []int, target int) []int {
     for k1, _ := range nums {
         for k2 := k1 + 1; k2 < len(nums); k2++ {
@@ -216,11 +218,11 @@ Javascript
 ```javascript
 var twoSum = function (nums, target) {
   let hash = {};
-  for (let i = 0; i < nums.length; i++) {
+  for (let i = 0; i < nums.length; i++) {  // 遍历当前元素，并在map中寻找是否有匹配的key
     if (hash[target - nums[i]] !== undefined) {
       return [i, hash[target - nums[i]]];
     }
-    hash[nums[i]] = i;
+    hash[nums[i]] = i;   // 如果没找到匹配对，就把访问过的元素和下标加入到map中
   }
   return [];
 };