diff --git a/source/chapter2/09_Classes_and_Structures.md b/source/chapter2/09_Classes_and_Structures.md
index f03fb521..dc25a4c2 100755
--- a/source/chapter2/09_Classes_and_Structures.md
+++ b/source/chapter2/09_Classes_and_Structures.md
@@ -15,6 +15,9 @@
 > 
 > 3.0.1， shanks， 2016-11-12
 
+> 4.0
+> 校对：[kemchenj](https://kemchenj.github.io/) 2017-09-21
+
 本页包含内容：
 
 - [类和结构体对比](#comparing_classes_and_structures)