diff --git a/problems/0707.设计链表.md b/problems/0707.设计链表.md
index c5a55574..37ce15ad 100644
--- a/problems/0707.设计链表.md
+++ b/problems/0707.设计链表.md
@@ -973,6 +973,7 @@ class MyLinkedList {
         // 处理头节点
         if (index === 0) {
             this.head = this.head!.next;
+            // 如果链表中只有一个元素，删除头节点后，需要处理尾节点
             if (index === this.size - 1) {
                 this.tail = null
             }