diff --git a/doc/release-notes/TypeScript 3.1.md b/doc/release-notes/TypeScript 3.1.md
index 1f57fc2..6e65e2c 100644
--- a/doc/release-notes/TypeScript 3.1.md	
+++ b/doc/release-notes/TypeScript 3.1.md	
@@ -40,7 +40,7 @@ readImage.sync = (path: string) => {
 此外，这种属性声明的方式允许我们表达一些常见的模式，例如React无状态函数型组件（SFCs）里的`defaultProps`和`propTpes` 。
 
 ```ts
-export const FooComponent => ({ name }) => (
+export const FooComponent = ({ name }) => (
     <div>Hello! I am {name}</div>
 );