diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md
index e3fb0fb5..bf1e173e 100644
--- a/problems/0001.两数之和.md
+++ b/problems/0001.两数之和.md
@@ -163,7 +163,7 @@ class Solution:
         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    # 遍历当前元素，并在map中寻找是否有匹配的key
+            records[value] = index    # 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 []
 ```
 （版本二）使用集合