diff --git a/problems/0024.两两交换链表中的节点.md b/problems/0024.两两交换链表中的节点.md
index 4dc051aa..12912382 100644
--- a/problems/0024.两两交换链表中的节点.md
+++ b/problems/0024.两两交换链表中的节点.md
@@ -410,7 +410,7 @@ impl Solution {
 // 递归
 impl Solution {
     pub fn swap_pairs(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
-        if head == None || head.as_ref().unwrap().next == None {
+        if head.is_none() || head.as_ref().unwrap().next.is_none() {
             return head;
         }