diff --git a/README.md b/README.md
index 2ab66ae..32987b9 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
    4. [抽象类与接口](03%EF%BC%9A%E7%B1%BB%E4%B8%8E%E5%AF%B9%E8%B1%A1/04.md)
 4. [第四章：异常处理](04%EF%BC%9A%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86/01.md)
 5. 第五章：IO编程
+   1. [文件类和文本文件](05%EF%BC%9AIO%E7%BC%96%E7%A8%8B/01.md)
 6. 第六章：集合与框架
 
 附录