diff --git a/Models/AccountMapper.php b/Models/AccountMapper.php
index b487b3c..68f6df8 100644
--- a/Models/AccountMapper.php
+++ b/Models/AccountMapper.php
@@ -51,6 +51,11 @@ final class AccountMapper extends DataMapperAbstract
     ];
 
     /**
+     * Has many relation.
+     *
+     * @var array<string, array<string, string>>
+     * @since 1.0.0
+     */    /**
      * Has many relation.
      *
      * @var array<string, array<string, string>>
diff --git a/Models/Group.php b/Models/Group.php
index d046fcf..63e450e 100644
--- a/Models/Group.php
+++ b/Models/Group.php
@@ -81,7 +81,7 @@ class Group extends \phpOMS\Account\Group
     /**
      * Get created by.
      *
-     * @return mixed
+     * @return int|\phpOMS\Account\Account
      *
      * @since  1.0.0
      */
diff --git a/Models/GroupMapper.php b/Models/GroupMapper.php
index 03eaccd..0d9aa86 100644
--- a/Models/GroupMapper.php
+++ b/Models/GroupMapper.php
@@ -67,6 +67,11 @@ final class GroupMapper extends DataMapperAbstract
     protected static $createdAt = 'group_created';
 
     /**
+     * Has many relation.
+     *
+     * @var array<string, array<string, string>>
+     * @since 1.0.0
+     */    /**
      * Has many relation.
      *
      * @var array<string, array<string, string>>
diff --git a/Models/Module.php b/Models/Module.php
index 6aa1d6e..0ae665b 100644
--- a/Models/Module.php
+++ b/Models/Module.php
@@ -199,6 +199,9 @@ class Module
      *
      * @since  1.0.0
      */
+    /**
+     * {@inheritdoc}
+     */
     public function jsonSerialize()
     {
         return $this->toArray();