diff --git a/Models/QAAnswerMapper.php b/Models/QAAnswerMapper.php
index fff2624..44f4ca8 100755
--- a/Models/QAAnswerMapper.php
+++ b/Models/QAAnswerMapper.php
@@ -46,7 +46,7 @@ final class QAAnswerMapper extends DataMapperAbstract
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, self:string}>
+     * @var array<string, array{mapper:string, external:string}>
      * @since 1.0.0
      */
     protected static array $belongsTo = [
diff --git a/Models/QACategoryMapper.php b/Models/QACategoryMapper.php
index f02b699..20e7705 100755
--- a/Models/QACategoryMapper.php
+++ b/Models/QACategoryMapper.php
@@ -41,7 +41,7 @@ final class QACategoryMapper extends DataMapperAbstract
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, self:string}>
+     * @var array<string, array{mapper:string, external:string}>
      * @since 1.0.0
      */
     protected static array $belongsTo = [
diff --git a/Models/QAQuestion.php b/Models/QAQuestion.php
index b8c604b..6dc6eda 100755
--- a/Models/QAQuestion.php
+++ b/Models/QAQuestion.php
@@ -68,7 +68,13 @@ class QAQuestion implements \JsonSerializable
      */
     private ?QACategory $category = null;
 
-    private $language = '';
+    /**
+     * Language
+     *
+     * @var string
+     * @since 1.0.0
+     */
+    private string $language = '';
 
     /**
      * Created by.
diff --git a/Models/QAQuestionMapper.php b/Models/QAQuestionMapper.php
index 6e5385e..f65e594 100755
--- a/Models/QAQuestionMapper.php
+++ b/Models/QAQuestionMapper.php
@@ -75,7 +75,7 @@ final class QAQuestionMapper extends DataMapperAbstract
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, self:string}>
+     * @var array<string, array{mapper:string, external:string}>
      * @since 1.0.0
      */
     protected static array $belongsTo = [