diff --git a/src/ch06-01-defining-an-enum.md b/src/ch06-01-defining-an-enum.md
index 7e020db..b6bbb11 100644
--- a/src/ch06-01-defining-an-enum.md
+++ b/src/ch06-01-defining-an-enum.md
@@ -1,4 +1,4 @@
-# 定义枚举
+## 定义枚举
 
 > [ch06-01-defining-an-enum.md](https://github.com/rust-lang/book/blob/master/src/ch06-01-defining-an-enum.md)
 > <br>
diff --git a/src/ch17-00-oop.md b/src/ch17-00-oop.md
index 93c73cf..d612379 100644
--- a/src/ch17-00-oop.md
+++ b/src/ch17-00-oop.md
@@ -1,4 +1,4 @@
-# Rust 的面向对象特性
+# Rust 的面向对象特性
 
 > [ch17-00-oop.md](https://github.com/rust-lang/book/blob/master/src/ch17-00-oop.md)
 > <br>