diff --git a/README-zh.md b/README-zh.md
new file mode 100644
index 0000000..a7ce0b6
--- /dev/null
+++ b/README-zh.md
@@ -0,0 +1,141 @@
+PSR-15 内容验证器
+===========================
+
+[English](README.md)
+
+[![GitHub Actions: Run tests](https://github.com/zfegg/content-validation/workflows/qa/badge.svg)](https://github.com/zfegg/content-validation/actions?query=workflow%3A%22qa%22)
+[![Coverage Status](https://coveralls.io/repos/github/zfegg/content-validation/badge.svg?branch=master)](https://coveralls.io/github/zfegg/content-validation?branch=master)
+[![Latest Stable Version](https://poser.pugx.org/zfegg/content-validation/v/stable.png)](https://packagist.org/packages/zfegg/content-validation)
+
+基于 PSR-15 内容验证中间件。
+内容验证使用 [`opis/json-schema`](https://packagist.org/packages/opis/json-schema).
+
+安装使用
+---------
+
+用 composer 安装.
+
+```bash
+composer require zfegg/content-validation
+```
+
+使用
+-----
+
+### `Opis\JsonSchema\Validator` 工厂配置
+
+```php
+// config.php
+return [
+    Opis\JsonSchema\Validator::class => [
+        'resolvers' => [
+            'protocolDir' => [
+                // foo-schema://host/foo.create.json => schema/dir/foo.create.json
+                ['foo-schema', 'host',  'schema/dir'],
+            ],
+            'protocol' => [
+            ],
+            'prefix' => [
+               ['prefix1', 'path/to/dir'],
+               ['prefix2', 'path/to/dir'],
+            ],
+            'file' => [
+               ['SchemaFoo', 'path/to/file'],
+               ['SchemaBar', 'path/to/file2'],
+            ],
+            'raw' => [
+               ['{"type":"object", ...}', 'schema id 1'],
+               ['{"type":"object", ...}', 'schema id 2'],
+            ]
+        ],
+        'filters' => [
+            'foo-filter' => ['filter' => 'FilterFilterName', 'types' => ['integer']],
+        ],
+        'filtersNS' => [
+            'foo-ns' => 'FilterResolverName',
+        ],
+    ]
+]
+```
+
+### Mezzio
+
+在 `config.php` 中添加 `ConfigProvider`.
+
+```php
+
+$aggregator = new ConfigAggregator(
+  [
+    // ...
+    \Zfegg\ContentValidation\ConfigProvider::class,
+  ]
+);
+
+return $aggregator->getMergedConfig();
+```
+
+
+```php
+$app->post(
+  '/api/users', 
+   [
+   \Zfegg\ContentValidation\ContentValidationMiddleware::class,
+    function (\Psr\Http\Message\ServerRequestInterface $request) {
+        $data = $request->getParsedBody(); // Get valid data.
+    }
+], 'api.users.create')
+->setOptions(['schema' => 'path-to-json-schema.json'])
+//->setOptions([  
+//   // or set json-schema object. 
+//  'schema' => (object) [
+//        'type' => 'object',
+//        'properties' => (object) [
+//             'age' => (object) [
+//                 'type' => 'integer'
+//              ]
+//        ],
+//        'required' => ['age']
+//   ]
+// ])
+;
+```
+
+无效请求将响应 422状态码.
+
+```shell
+curl "http://host/api/users" -d 'username=foo'
+
+HTTP/1.1 422
+
+{
+  "status": 422,
+  "detail": "Failed Validation",
+  "validation_messages": {
+    "age": [
+      "The required properties (age) are missing"
+    ]
+  }
+}
+```
+
+
+### Slim 
+
+```php
+$app->post(
+  '/api/users', 
+  function (\Psr\Http\Message\ServerRequestInterface $request) {
+        $data = $request->getParsedBody(); // Get valid data.
+  }
+)
+->add(\Zfegg\ContentValidation\ContentValidationMiddleware::class)
+->setArgument('schema', 'path-to-json-schema.json')
+;
+```
+
+验证器
+--------
+
+- [`DbalRecordExistsFilter`](src/Opis/Filter/DbalRecordExistsFilter.php): 使用 `doctrine/dbal` 验证DB记录是否存在
+- [`DoctrineRecordExistsFilter`](src/Opis/Filter/DoctrineRecordExistsFilter.php): 使用 `doctrine/orm` 验证DB记录是否存在
+- [`RecordExistsFilter`](src/Opis/Filter/RecordExistsFilter.php): 使用 `PDO` 验证DB记录是否存在
\ No newline at end of file
diff --git a/README.md b/README.md
index 6e6c2e3..798e9f7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
-PSR-15 Content Validation / PSR-15 内容验证器
+PSR-15 Content Validation
 ===========================
 
+[简体中文](README-zh.md)
+
+
 [![GitHub Actions: Run tests](https://github.com/zfegg/content-validation/workflows/qa/badge.svg)](https://github.com/zfegg/content-validation/actions?query=workflow%3A%22qa%22)
 [![Coverage Status](https://coveralls.io/repos/github/zfegg/content-validation/badge.svg?branch=master)](https://coveralls.io/github/zfegg/content-validation?branch=master)
 [![Latest Stable Version](https://poser.pugx.org/zfegg/content-validation/v/stable.png)](https://packagist.org/packages/zfegg/content-validation)
@@ -8,11 +11,7 @@ PSR-15 Content Validation / PSR-15 内容验证器
 Content validation for PSR-15 middleware. 
 Based on [`opis/json-schema`](https://packagist.org/packages/opis/json-schema).
 
-
-基于 PSR-15 内容验证中间件。
-内容验证使用 [`opis/json-schema`](https://packagist.org/packages/opis/json-schema).
-
-Installation / 安装使用
+Installation
 -----------------------
 
 Install via composer.
@@ -21,7 +20,7 @@ Install via composer.
 composer require zfegg/content-validation
 ```
 
-Usage / 使用
+Usage
 --------------
 
 ### `Opis\JsonSchema\Validator` factory config.
@@ -62,7 +61,7 @@ return [
 
 ### Mezzio
 
-Add `ConfigProvider` in 'config.php'. / 在 `config.php` 中添加 `ConfigProvider`.
+Add `ConfigProvider` in 'config.php'.
 
 ```php
 
@@ -102,7 +101,7 @@ $app->post(
 ;
 ```
 
-Invalid request will response status 422. / 无效请求将响应 422状态码.
+Invalid request will response status 422.
 
 ```shell
 curl "http://host/api/users" -d 'username=foo'
@@ -133,4 +132,12 @@ $app->post(
 ->add(\Zfegg\ContentValidation\ContentValidationMiddleware::class)
 ->setArgument('schema', 'path-to-json-schema.json')
 ;
-```
\ No newline at end of file
+```
+
+
+Validators
+----------
+
+- [`DbalRecordExistsFilter`](src/Opis/Filter/DbalRecordExistsFilter.php) : Use `doctrine/dbal` to check record exists.
+- [`DoctrineRecordExistsFilter`](src/Opis/Filter/DoctrineRecordExistsFilter.php) : Use `doctrine/orm` to check record exists.
+- [`RecordExistsFilter`](src/Opis/Filter/RecordExistsFilter.php) : Use `PDO` to check record exists.
\ No newline at end of file