diff --git a/codes/csharp/chapter_computational_complexity/iteration.cs b/codes/csharp/chapter_computational_complexity/iteration.cs
index 38ae18cef..0505fb060 100644
--- a/codes/csharp/chapter_computational_complexity/iteration.cs
+++ b/codes/csharp/chapter_computational_complexity/iteration.cs
@@ -33,7 +33,7 @@ public class iteration {
     int WhileLoopII(int n) {
         int res = 0;
         int i = 1; // 初始化条件变量
-        // 循环求和 1, 2, 4, 5...
+        // 循环求和 1, 4, 10, ...
         while (i <= n) {
             res += i;
             // 更新条件变量