diff --git a/README.md b/README.md
index 3b4b7a2..7607584 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ composer require kaopur/yii2-doc-online
     ```
     'modules' => [
         'doconline' => [
+            'item' => 'app',//app、frontend、backend
             'class' => 'Kaopur\yii2_doc_online\Module',
             'defaultRoute' => 'index', //默认控制器
             'appControllers' => true, //是否检测app\controllers命名空间下的控制器
diff --git a/src/ApiDesc.php b/src/ApiDesc.php
index 40a5f6b..85c632f 100644
--- a/src/ApiDesc.php
+++ b/src/ApiDesc.php
@@ -35,14 +35,15 @@ public function render() {
         $exceptions = array();
 
         $exploade_service = explode('/', $service);
+        $item = \Yii::$app->modules['doconline']->item;
         switch (count($exploade_service)) {
             case 2:
-                $classNameTpl = '\\app\\controllers\\%sController';
+                $classNameTpl = "\\$item\\controllers\\%sController";
                 $className = sprintf($classNameTpl, ucfirst($exploade_service[0]));
                 $methodName = 'action' .ucfirst($exploade_service[1]);
                 break;
             case 3:
-                $classNameTpl = '\\app\\modules\\%s\\controllers\\%sController';
+                $classNameTpl = "\\$item\\modules\\%s\\controllers\\%sController";
                 $className = sprintf($classNameTpl, $exploade_service[0], ucfirst($exploade_service[1]));
                 $methodName = 'action' .ucfirst($exploade_service[2]);
                 break;
diff --git a/src/ApiList.php b/src/ApiList.php
index b2a84ce..6cc30ee 100644
--- a/src/ApiList.php
+++ b/src/ApiList.php
@@ -36,7 +36,8 @@ public function render($modules = []) {
         if ($this->appControllers) {
             $files = listDir(API_ROOT . D_S . $apiDirName);
             $classesName = array_map(function($file){
-                $classNameTemp = '/app' . rtrim(strstr($file, '/controllers/'), '.php');
+                $item = \Yii::$app->modules['doconline']->item;
+                $classNameTemp = "/$item" . rtrim(strstr($file, '/controllers/'), '.php');
                 $className = str_replace('/', '\\', $classNameTemp);
                 return $className;
             }, $files);
@@ -46,7 +47,8 @@ public function render($modules = []) {
             $moduleDirName = '../modules/' . $module . '/controllers';
             $moduleFiles = listDir(API_ROOT . D_S . $moduleDirName);
             return array_map(function($moduleFile) use ($module) {
-                $namespace = '\\app\\modules\\%s\\controllers\\%s';
+                $item = \Yii::$app->modules['doconline']->item;
+                $namespace = "\\$item\\modules\\%s\\controllers\\%s";
                 $className = rtrim(substr($moduleFile, strrpos($moduleFile, D_S) + 1), '.php');
                 return sprintf($namespace, $module, $className);
             }, $moduleFiles);
@@ -85,7 +87,7 @@ public function render($modules = []) {
             $docComment = $ref->getDocComment();
             if ($docComment !== false) {
                 $docCommentArr = explode("\n", $docComment);
-                $comment       = isset($docCommentArr[1])?trim($docCommentArr[1]):'';
+                $comment       = trim($docCommentArr[1]);
                 $title         = trim(substr($comment, strpos($comment, '*') + 1));
                 foreach ($docCommentArr as $comment) {
                     $pos = stripos($comment, '@desc');
diff --git a/src/Module.php b/src/Module.php
index fe9238b..4bab4d2 100644
--- a/src/Module.php
+++ b/src/Module.php
@@ -9,6 +9,7 @@ class Module extends \yii\base\Module
     public $suffix = '';
     public $prefix = '';
     public $modules = [];
+    public $item = 'app';
     public function init()
     {
         parent::init();