diff --git a/problems/0344.反转字符串.md b/problems/0344.反转字符串.md
index 6ffbac26..775cfc58 100644
--- a/problems/0344.反转字符串.md
+++ b/problems/0344.反转字符串.md
@@ -130,6 +130,9 @@ public:
 };
 ```
 
+* 时间复杂度: O(n)
+* 空间复杂度: O(1)
+