diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md
index a0acdcbe..b3abb991 100644
--- a/problems/0001.两数之和.md
+++ b/problems/0001.两数之和.md
@@ -109,6 +109,9 @@ public:
 };
 ```
 
+* 时间复杂度: O(n)
+* 空间复杂度: O(n)
+
 ## 总结 
 
 本题其实有四个重点：