diff --git a/Introduction.md b/Introduction.md
index eb3c098..e774c61 100644
--- a/Introduction.md
+++ b/Introduction.md
@@ -92,10 +92,12 @@
 <li>binlog event structure，详细信息请参考： 
 
 ~~http://forge.mysql.com/wiki/MySQL_Internals_Binary_Log~~
+<a href="https://dev.mysql.com/doc/internals/en/binary-log.html">https://dev.mysql.com/doc/internals/en/binary-log.html</a>
 
 <a href="https://dev.mysql.com/doc/internals/en/event-structure.html">https://dev.mysql.com/doc/internals/en/event-structure.html</a>
 
 <a href="https://dev.mysql.com/doc/internals/en/binlog-event.html">https://dev.mysql.com/doc/internals/en/binlog-event.html</a>
+
 </li>
 </ul>
 <h2>EventSink设计</h2>