diff --git a/problems/0020.有效的括号.md b/problems/0020.有效的括号.md
index f2f5cdd1..9d9168e3 100644
--- a/problems/0020.有效的括号.md
+++ b/problems/0020.有效的括号.md
@@ -166,7 +166,7 @@ class Solution {
                 deque.pop();
             }
         }
-        //最后判断栈中元素是否匹配
+        //遍历结束，如果栈为空，则括号全部匹配
         return deque.isEmpty();
     }
 }
@@ -555,3 +555,4 @@ impl Solution {
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>
 </a>
+