diff --git a/components/form/demo/control-ref.md b/components/form/demo/control-ref.md
index e1763ec2bb..981bc57931 100644
--- a/components/form/demo/control-ref.md
+++ b/components/form/demo/control-ref.md
@@ -15,6 +15,7 @@ We recommend use `Form.useForm` to create data control. If you are using class c
 
 ```tsx
 import { Form, Input, Button, Select } from 'antd';
+import { FormInstance } from 'antd/lib/form';
 
 const { Option } = Select;
 
@@ -27,7 +28,7 @@ const tailLayout = {
 };
 
 class Demo extends React.Component {
-  formRef = React.createRef();
+  formRef = React.createRef<FormInstance>();
 
   onGenderChange = value => {
     this.formRef.current.setFieldsValue({
diff --git a/components/form/index.en-US.md b/components/form/index.en-US.md
index 084ae1aeea..37a765ad3b 100644
--- a/components/form/index.en-US.md
+++ b/components/form/index.en-US.md
@@ -312,7 +312,7 @@ Before Modal open, children elements do not exist in the view. You can set `forc
 
 Components inside Form.Item with name property will turn into controlled mode, that makes `defaultValue` does not work anymore. Please try `initialValues` of Form to set default value.
 
-### Why resetFields will re-mount component?
+### Why `resetFields` will re-mount component?
 
 `resetFields` will re-mount component under Field to clean up customize component side effect(like asyn data, cached state, etc.). It's by design.
 
diff --git a/components/form/index.zh-CN.md b/components/form/index.zh-CN.md
index 1b6ab3dfe3..574aac58bf 100644
--- a/components/form/index.zh-CN.md
+++ b/components/form/index.zh-CN.md
@@ -309,11 +309,11 @@ validator(rule, value, callback) => {
 
 这是因为你在调用 form 方法时，Modal 还未初始化导致 form 没有关联任何 Form 组件。你可以通过给 Modal 设置 `forceRender` 将其预渲染。示例点击[此处](https://codesandbox.io/s/antd-reproduction-template-ibu5c)。
 
-### 为什么 Form.Item 下的子组件 defaultValue 不生效？
+### 为什么 Form.Item 下的子组件 `defaultValue` 不生效？
 
 当你为 Form.Item 设置 `name` 属性后，子组件会转为受控模式。因而 `defaultValue` 不会生效。你需要在 Form 上通过 `initialValues` 设置默认值。
 
-### 为什么 resetFields 会重新 mount 组件？
+### 为什么 `resetFields` 会重新 mount 组件？
 
 `resetFields` 会重置整个 Field，因而其子组件也会重新 mount 从而消除自定义组件可能存在的副作用（例如异步数据、状态等等）。