diff --git a/notes/算法 - 排序.md b/notes/算法 - 排序.md
index edd086c1..b4c9ed52 100644
--- a/notes/算法 - 排序.md	
+++ b/notes/算法 - 排序.md	
@@ -45,7 +45,9 @@ public class Selection<T extends Comparable<T>> extends Sort<T> {
                     min = j;
                 }
             }
-            swap(nums, i, min);
+            if (min != i) {
+                swap(nums, i, min);
+            }
         }
     }
 }