diff --git a/深入探索 JavaScript/JavaScript 语法.md b/深入探索 JavaScript/JavaScript 语法.md
index 17eeca1..7d0e360 100644
--- a/深入探索 JavaScript/JavaScript 语法.md	
+++ b/深入探索 JavaScript/JavaScript 语法.md	
@@ -44,4 +44,8 @@ console.log(foo); // undefined
 if(true) {
 	function foo(){ }
 }
-```
\ No newline at end of file
+```
+
+## class 声明
+
+class 声明也是存在预处理的，但是它的行为会更加的符合直觉，
\ No newline at end of file