diff --git a/source/chapter2/11_Methods.md b/source/chapter2/11_Methods.md
index 6bfcab74..2a611974 100755
--- a/source/chapter2/11_Methods.md
+++ b/source/chapter2/11_Methods.md
@@ -14,6 +14,9 @@
 > 2.2
 > 校对：[SketchK](https://github.com/SketchK) 2016-05-13
 > 3.0.1，shanks，2016-11-13
+
+> 4.0
+> 校对：[kemchenj](https://kemchenj.github.io/) 2017-09-21
 
 本页包含内容：
 
@@ -278,3 +281,5 @@ if player.tracker.advance(to: 6) {
 }
 // 打印 "level 6 has not yet been unlocked"
 ```
+
+