diff --git a/Models/Arrival.php b/Models/Arrival.php
index 608bd0d..a01c45b 100644
--- a/Models/Arrival.php
+++ b/Models/Arrival.php
@@ -104,14 +104,14 @@ class Arrival
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function init($id)
+    public function init($id) : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
     public function __clone()
     {
@@ -168,7 +168,7 @@ class Arrival
      *
      * @since  1.0.0
      */
-    public function setDate($date)
+    public function setDate($date) : void
     {
         $this->date = $date;
     }
@@ -194,7 +194,7 @@ class Arrival
      *
      * @since  1.0.0
      */
-    public function setOrder($order)
+    public function setOrder($order) : void
     {
         $this->order = $order;
     }
@@ -220,7 +220,7 @@ class Arrival
      *
      * @since  1.0.0
      */
-    public function setFrom($from)
+    public function setFrom($from) : void
     {
         $this->from = $from;
     }
@@ -246,7 +246,7 @@ class Arrival
      *
      * @since  1.0.0
      */
-    public function setStatus($status)
+    public function setStatus($status) : void
     {
         $this->status = $status;
     }
@@ -284,43 +284,43 @@ class Arrival
      *
      * @since  1.0.0
      */
-    public function setAcceptor($acceptor)
+    public function setAcceptor($acceptor) : void
     {
         $this->acceptor = $acceptor;
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function delete()
+    public function delete() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function create()
+    public function create() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function update()
+    public function update() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function serialize()
+    public function serialize() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function unserialize($data)
+    public function unserialize($data) : void
     {
     }
 }
diff --git a/Models/Article.php b/Models/Article.php
index a0f5c5a..056aa61 100644
--- a/Models/Article.php
+++ b/Models/Article.php
@@ -146,14 +146,14 @@ class Article
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function init($id)
+    public function init($id) : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
     public function __clone()
     {
@@ -210,7 +210,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function setName($name)
+    public function setName($name) : void
     {
         $this->name = $name;
     }
@@ -236,7 +236,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function setMatchcode($matchcode)
+    public function setMatchcode($matchcode) : void
     {
         $this->matchcode = $matchcode;
     }
@@ -262,7 +262,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function setDescription($desc)
+    public function setDescription($desc) : void
     {
         $this->description = $desc;
     }
@@ -288,7 +288,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function setCreated($created)
+    public function setCreated($created) : void
     {
         $this->created = $created;
     }
@@ -314,7 +314,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function setCreator($creator)
+    public function setCreator($creator) : void
     {
         $this->creator = $creator;
     }
@@ -329,7 +329,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function addPrice($price, $db = true)
+    public function addPrice($price, $db = true) : void
     {
         $id                = 0; /* insert and get id */
         $this->prices[$id] = $price;
@@ -345,7 +345,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function removePrice($id, $db = true)
+    public function removePrice($id, $db = true) : void
     {
         if (isset($this->prices[$id])) {
             unset($this->prices[$id]);
@@ -363,7 +363,7 @@ class Article
      *
      * @since  1.0.0
      */
-    public function editPrice($id, $price, $db = true)
+    public function editPrice($id, $price, $db = true) : void
     {
         if (isset($this->prices[$id])) {
             $this->prices[$id] = $price;
@@ -371,37 +371,37 @@ class Article
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function delete()
+    public function delete() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function create()
+    public function create() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function update()
+    public function update() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function serialize()
+    public function serialize() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function unserialize($data)
+    public function unserialize($data) : void
     {
     }
 }
diff --git a/Models/Shipping.php b/Models/Shipping.php
index 6c71bdc..da543ba 100644
--- a/Models/Shipping.php
+++ b/Models/Shipping.php
@@ -120,14 +120,14 @@ class Shipping
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function init($id)
+    public function init($id) : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
     public function __clone()
     {
@@ -166,7 +166,7 @@ class Shipping
      *
      * @since  1.0.0
      */
-    public function setOrder($order)
+    public function setOrder($order) : void
     {
         $this->order = $order;
     }
@@ -192,7 +192,7 @@ class Shipping
      *
      * @since  1.0.0
      */
-    public function setDelivered($delivered)
+    public function setDelivered($delivered) : void
     {
         $this->delivered = $delivered;
     }
@@ -218,7 +218,7 @@ class Shipping
      *
      * @since  1.0.0
      */
-    public function setTo($to)
+    public function setTo($to) : void
     {
         $this->to = $to;
     }
@@ -244,7 +244,7 @@ class Shipping
      *
      * @since  1.0.0
      */
-    public function setStatus($status)
+    public function setStatus($status) : void
     {
         $this->status = $status;
     }
@@ -282,43 +282,43 @@ class Shipping
      *
      * @since  1.0.0
      */
-    public function setSender($sender)
+    public function setSender($sender) : void
     {
         $this->sender = $sender;
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function delete()
+    public function delete() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function create()
+    public function create() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function update()
+    public function update() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function serialize()
+    public function serialize() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function unserialize($data)
+    public function unserialize($data) : void
     {
     }
 }
diff --git a/Models/Warehouse.php b/Models/Warehouse.php
index 7fcf83a..bc9a1f0 100644
--- a/Models/Warehouse.php
+++ b/Models/Warehouse.php
@@ -88,14 +88,14 @@ class Warehouse
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function init($id)
+    public function init($id) : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
     public function __clone()
     {
@@ -134,7 +134,7 @@ class Warehouse
      *
      * @since  1.0.0
      */
-    public function setName($name)
+    public function setName($name) : void
     {
         $this->name = $name;
     }
@@ -160,7 +160,7 @@ class Warehouse
      *
      * @since  1.0.0
      */
-    public function setDescription($description)
+    public function setDescription($description) : void
     {
         $this->description = $description;
     }
@@ -186,43 +186,43 @@ class Warehouse
      *
      * @since  1.0.0
      */
-    public function setLocation($location)
+    public function setLocation($location) : void
     {
         $this->location = $location;
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function delete()
+    public function delete() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function create()
+    public function create() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function update()
+    public function update() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function serialize()
+    public function serialize() : void
     {
     }
 
     /**
-     * {@inheritdoc}
+     * 
      */
-    public function unserialize($data)
+    public function unserialize($data) : void
     {
     }
 }