diff --git a/lib/Models/Model.php b/lib/Models/Model.php
index 8585b3d46e..6865499433 100644
--- a/lib/Models/Model.php
+++ b/lib/Models/Model.php
@@ -74,6 +74,7 @@ use MailPoet\WP\Functions as WPFunctions;
  * @method $this whereRaw($clause, $parameters=array())
  * @method static $this whereRaw($clause, $parameters=array())
  * @method $this deleteMany()
+ * @method static $this deleteMany()
  * @method $this orderByDesc($column_name)
  * @method static $this orderByDesc($column_name)
  * @method $this orderByAsc($column_name)
diff --git a/lib/Models/Newsletter.php b/lib/Models/Newsletter.php
index 7992f03a58..00df307b87 100644
--- a/lib/Models/Newsletter.php
+++ b/lib/Models/Newsletter.php
@@ -22,7 +22,7 @@ use function MailPoet\Util\array_column;
 /**
  * @property int $id
  * @property string $type
- * @property object|boolean $queue
+ * @property object|array|boolean $queue
  * @property string $hash
  * @property string $sender_address
  * @property string $status
diff --git a/lib/Models/StatisticsNewsletters.php b/lib/Models/StatisticsNewsletters.php
index e7dfb656d1..8ec10fd8c3 100644
--- a/lib/Models/StatisticsNewsletters.php
+++ b/lib/Models/StatisticsNewsletters.php
@@ -2,6 +2,9 @@
 
 namespace MailPoet\Models;
 
+/**
+ * @property string|null $sent_at
+ */
 class StatisticsNewsletters extends Model {
   public static $_table = MP_STATISTICS_NEWSLETTERS_TABLE;
 
diff --git a/lib/Tasks/Sending.php b/lib/Tasks/Sending.php
index 12cd6a20c8..34b83c92cb 100644
--- a/lib/Tasks/Sending.php
+++ b/lib/Tasks/Sending.php
@@ -15,6 +15,7 @@ use function MailPoet\Util\array_column;
  * @property string|null $status
  * @property int $task_id
  * @property int $id
+ * @property int $newsletter_id
  */
 class Sending {
   const TASK_TYPE = 'sending';