diff --git a/problems/0707.设计链表.md b/problems/0707.设计链表.md
index 145efa18..4f2938bc 100644
--- a/problems/0707.设计链表.md
+++ b/problems/0707.设计链表.md
@@ -847,6 +847,10 @@ MyLinkedList.prototype.deleteAtIndex = function(index) {
     if(index < 0 || index >= this._size) return;
     if(index === 0) {
         this._head = this._head.next;
+        // 如果删除的这个节点同时是尾节点，要处理尾节点
+        if(index === this._size - 1){
+            this._tail = this._head
+        }
         this._size--;
         return;
     }