diff --git a/problems/面试题02.07.链表相交.md b/problems/面试题02.07.链表相交.md
index dd91f069..2e7226de 100644
--- a/problems/面试题02.07.链表相交.md
+++ b/problems/面试题02.07.链表相交.md
@@ -224,12 +224,14 @@ var getIntersectionNode = function(headA, headB) {
         lenA = getListLen(headA),
         lenB = getListLen(headB);
     if(lenA < lenB) {
+        // 下面交换变量注意加 “分号” ，两个数组交换变量在同一个作用域下时
+        // 如果不加分号，下面两条代码等同于一条代码: [curA, curB] = [lenB, lenA]
         [curA, curB] = [curB, curA];
         [lenA, lenB] = [lenB, lenA];
     }
     let i = lenA - lenB;
     while(i-- > 0) {
-        curA = curA.next
+        curA = curA.next;
     }
     while(curA && curA !== curB) {
         curA = curA.next;