diff --git a/modules/backend/controllers/AccessLogs.php b/modules/backend/controllers/AccessLogs.php
index 7057830f9..512048faf 100644
--- a/modules/backend/controllers/AccessLogs.php
+++ b/modules/backend/controllers/AccessLogs.php
@@ -10,18 +10,29 @@ use System\Classes\SettingsManager;
  *
  * @package october\system
  * @author Alexey Bobkov, Samuel Georges
- *
  */
 class AccessLogs extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\ListController::class
     ];
 
-    public $requiredPermissions = ['system.access_logs'];
-
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.access_logs'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/backend/controllers/Auth.php b/modules/backend/controllers/Auth.php
index 6a6c72cb4..54118e771 100644
--- a/modules/backend/controllers/Auth.php
+++ b/modules/backend/controllers/Auth.php
@@ -21,8 +21,14 @@ use Exception;
  */
 class Auth extends Controller
 {
+    /**
+     * @var array Public controller actions
+     */
     protected $publicActions = ['index', 'signin', 'signout', 'restore', 'reset'];
 
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/backend/controllers/Index.php b/modules/backend/controllers/Index.php
index 8536f1e84..962186efd 100644
--- a/modules/backend/controllers/Index.php
+++ b/modules/backend/controllers/Index.php
@@ -18,6 +18,7 @@ class Index extends Controller
     use \Backend\Traits\InspectableContainer;
 
     /**
+     * @var array Permissions required to view this page.
      * @see checkPermissionRedirect()
      */
     public $requiredPermissions = [];
diff --git a/modules/backend/controllers/Preferences.php b/modules/backend/controllers/Preferences.php
index fb6618adb..9a79f88b5 100644
--- a/modules/backend/controllers/Preferences.php
+++ b/modules/backend/controllers/Preferences.php
@@ -18,11 +18,17 @@ use Backend\Models\Preference as PreferenceModel;
 class Preferences extends Controller
 {
     public $implement = [
-        'Backend.Behaviors.FormController',
+        \Backend\Behaviors\FormController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['backend.manage_preferences'];
 
     /**
diff --git a/modules/backend/controllers/UserGroups.php b/modules/backend/controllers/UserGroups.php
index 97b55e399..f0a0dab22 100644
--- a/modules/backend/controllers/UserGroups.php
+++ b/modules/backend/controllers/UserGroups.php
@@ -14,16 +14,32 @@ use System\Classes\SettingsManager;
  */
 class UserGroups extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
+
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['backend.manage_users'];
 
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/backend/controllers/UserRoles.php b/modules/backend/controllers/UserRoles.php
index 76587d1a2..942021cfe 100644
--- a/modules/backend/controllers/UserRoles.php
+++ b/modules/backend/controllers/UserRoles.php
@@ -16,16 +16,32 @@ use System\Classes\SettingsManager;
  */
 class UserRoles extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
+
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['backend.manage_users'];
 
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/backend/controllers/Users.php b/modules/backend/controllers/Users.php
index fbbdcc1d5..2b23ff085 100644
--- a/modules/backend/controllers/Users.php
+++ b/modules/backend/controllers/Users.php
@@ -16,18 +16,32 @@ use System\Classes\SettingsManager;
  */
 class Users extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
+
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
-    public $requiredPermissions = ['backend.manage_users'];
-
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $bodyClass = 'compact-container';
 
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/cms/controllers/Index.php b/modules/cms/controllers/Index.php
index 5f421c95f..d0c7c4498 100644
--- a/modules/cms/controllers/Index.php
+++ b/modules/cms/controllers/Index.php
@@ -35,8 +35,14 @@ class Index extends Controller
 {
     use \Backend\Traits\InspectableContainer;
 
+    /**
+     * @var Cms\Classes\Theme
+     */
     protected $theme;
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = [
         'cms.manage_content',
         'cms.manage_assets',
diff --git a/modules/cms/controllers/Media.php b/modules/cms/controllers/Media.php
index b157e75a1..9d7b6d0b5 100644
--- a/modules/cms/controllers/Media.php
+++ b/modules/cms/controllers/Media.php
@@ -12,6 +12,9 @@ use Cms\Widgets\MediaManager;
  */
 class Media extends Controller
 {
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['media.*'];
 
     /**
diff --git a/modules/cms/controllers/ThemeLogs.php b/modules/cms/controllers/ThemeLogs.php
index 67ddbc77f..03bd0cd79 100644
--- a/modules/cms/controllers/ThemeLogs.php
+++ b/modules/cms/controllers/ThemeLogs.php
@@ -21,17 +21,32 @@ use Exception;
  */
 class ThemeLogs extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
-    public $requiredPermissions = ['system.access_logs'];
-
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.access_logs'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/cms/controllers/ThemeOptions.php b/modules/cms/controllers/ThemeOptions.php
index 11122ce57..6f44476ad 100644
--- a/modules/cms/controllers/ThemeOptions.php
+++ b/modules/cms/controllers/ThemeOptions.php
@@ -19,12 +19,21 @@ use Exception;
  */
 class ThemeOptions extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController'
+        \Backend\Behaviors\FormController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['cms.manage_themes', 'cms.manage_theme_options'];
 
     /**
diff --git a/modules/cms/controllers/Themes.php b/modules/cms/controllers/Themes.php
index d2fec58f4..378ab6666 100644
--- a/modules/cms/controllers/Themes.php
+++ b/modules/cms/controllers/Themes.php
@@ -27,6 +27,9 @@ use Exception;
  */
 class Themes extends Controller
 {
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['cms.manage_themes'];
 
     /**
diff --git a/modules/system/controllers/EventLogs.php b/modules/system/controllers/EventLogs.php
index 84fd5f55c..b303b978c 100644
--- a/modules/system/controllers/EventLogs.php
+++ b/modules/system/controllers/EventLogs.php
@@ -22,17 +22,32 @@ use Exception;
  */
 class EventLogs extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
-    public $requiredPermissions = ['system.access_logs'];
-
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.access_logs'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/controllers/MailBrandSettings.php b/modules/system/controllers/MailBrandSettings.php
index c210b2ed1..3a1181509 100644
--- a/modules/system/controllers/MailBrandSettings.php
+++ b/modules/system/controllers/MailBrandSettings.php
@@ -25,14 +25,26 @@ use Exception;
  */
 class MailBrandSettings extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
         \Backend\Behaviors\FormController::class
     ];
 
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['system.manage_mail_templates'];
 
+    /**
+     * @var string HTML body tag class
+     */
     public $bodyClass = 'compact-container';
 
     /**
diff --git a/modules/system/controllers/MailLayouts.php b/modules/system/controllers/MailLayouts.php
index da913c2be..126797cd4 100644
--- a/modules/system/controllers/MailLayouts.php
+++ b/modules/system/controllers/MailLayouts.php
@@ -20,14 +20,26 @@ use Exception;
  */
 class MailLayouts extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
+        \Backend\Behaviors\FormController::class,
     ];
 
-    public $requiredPermissions = ['system.manage_mail_templates'];
-
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.manage_mail_templates'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/controllers/MailPartials.php b/modules/system/controllers/MailPartials.php
index b7692d031..93536a2ed 100644
--- a/modules/system/controllers/MailPartials.php
+++ b/modules/system/controllers/MailPartials.php
@@ -20,14 +20,26 @@ use Exception;
  */
 class MailPartials extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
+        \Backend\Behaviors\FormController::class,
     ];
 
-    public $requiredPermissions = ['system.manage_mail_templates'];
-
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.manage_mail_templates'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/controllers/MailTemplates.php b/modules/system/controllers/MailTemplates.php
index 5e0f95ad9..dc9c90e46 100644
--- a/modules/system/controllers/MailTemplates.php
+++ b/modules/system/controllers/MailTemplates.php
@@ -22,21 +22,36 @@ use Exception;
  */
 class MailTemplates extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
 
-    public $requiredPermissions = ['system.manage_mail_templates'];
+    /**
+     * @var array `FormController` configuration.
+     */
+    public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = [
         'templates' => 'config_templates_list.yaml',
         'layouts' => 'config_layouts_list.yaml',
         'partials' => 'config_partials_list.yaml'
     ];
 
-    public $formConfig = 'config_form.yaml';
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.manage_mail_templates'];
 
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/controllers/RequestLogs.php b/modules/system/controllers/RequestLogs.php
index 79d06e49e..e9a52eaad 100644
--- a/modules/system/controllers/RequestLogs.php
+++ b/modules/system/controllers/RequestLogs.php
@@ -21,17 +21,31 @@ use Exception;
  */
 class RequestLogs extends Controller
 {
+    /**
+     * @var array Extensions implemented by this controller.
+     */
     public $implement = [
-        'Backend.Behaviors.FormController',
-        'Backend.Behaviors.ListController'
+        \Backend\Behaviors\FormController::class,
+        \Backend\Behaviors\ListController::class
     ];
-
-    public $requiredPermissions = ['system.access_logs'];
-
+    /**
+     * @var array `FormController` configuration.
+     */
     public $formConfig = 'config_form.yaml';
 
+    /**
+     * @var array `ListController` configuration.
+     */
     public $listConfig = 'config_list.yaml';
 
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['system.access_logs'];
+
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/controllers/Updates.php b/modules/system/controllers/Updates.php
index f2166dd28..bf3017d39 100644
--- a/modules/system/controllers/Updates.php
+++ b/modules/system/controllers/Updates.php
@@ -31,12 +31,29 @@ use Exception;
  */
 class Updates extends Controller
 {
-    public $implement = ['Backend.Behaviors.ListController'];
+    /**
+     * @var array Extensions implemented by this controller.
+     */
+    public $implement = [
+        \Backend\Behaviors\ListController::class
+    ];
 
+    /**
+     * @var array `ListController` configuration.
+     */
+    public $listConfig = [
+        'list' => 'config_list.yaml',
+        'manage' => 'config_manage_list.yaml'
+    ];
+
+    /**
+     * @var array Permissions required to view this page.
+     */
     public $requiredPermissions = ['system.manage_updates'];
 
-    public $listConfig = ['list' => 'config_list.yaml', 'manage' => 'config_manage_list.yaml'];
-
+    /**
+     * Constructor.
+     */
     public function __construct()
     {
         parent::__construct();
diff --git a/modules/system/models/MailSetting.php b/modules/system/models/MailSetting.php
index dd6a9c560..348ca9be8 100644
--- a/modules/system/models/MailSetting.php
+++ b/modules/system/models/MailSetting.php
@@ -24,7 +24,9 @@ class MailSetting extends Model
     /**
      * @var array Behaviors implemented by this model.
      */
-    public $implement = ['System.Behaviors.SettingsModel'];
+    public $implement = [
+        \System\Behaviors\SettingsModel::class
+    ];
 
     /**
      * @var string Unique code