diff --git a/notes/算法.md b/notes/算法.md
index 98e15931..d6e21d6a 100644
--- a/notes/算法.md
+++ b/notes/算法.md
@@ -301,7 +301,7 @@ public class Selection<T extends Comparable<T>> extends Sort<T> {
     @Override
     public void sort(T[] nums) {
         int N = nums.length;
-        for (int i = 0; i < N; i++) {
+        for (int i = 0; i < N - 1; i++) {
             int min = i;
             for (int j = i + 1; j < N; j++) {
                 if (less(nums[j], nums[min])) {