diff --git a/Client/PostcodeClient.php b/Client/PostcodeClient.php
index 6159d37..c4efca3 100644
--- a/Client/PostcodeClient.php
+++ b/Client/PostcodeClient.php
@@ -1,6 +1,6 @@
 <?php
 /*
-* (c) Api Postcode <info@api-postcode.nl>
+* (c) Wessel Strengholt <wessel.strengholt@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
@@ -39,7 +39,7 @@ public function __construct($token)
      *
      * @return Address
      */
-    public function fetchAddress($zipCode, $houseNumber)
+    public function fetchAddress($zipCode, $houseNumber): Address
     {
         if (0 === preg_match('/^[1-9]{1}[0-9]{3}[\s]{0,1}[a-z]{2}$/i', $zipCode)) {
             throw new InvalidPostcodeException('Given postcode incorrect');
diff --git a/Model/Address.php b/Model/Address.php
index b92b27a..df370c0 100644
--- a/Model/Address.php
+++ b/Model/Address.php
@@ -95,7 +95,7 @@ public function getLatitude(): float
     /**
      * @param float $latitude
      */
-    public function setLatitude(float $latitude)
+    public function setLatitude(float $latitude): void
     {
         $this->latitude = $latitude;
     }
@@ -111,7 +111,7 @@ public function getLongitude(): float
     /**
      * @param float $longitude
      */
-    public function setLongitude(float $longitude)
+    public function setLongitude(float $longitude): void
     {
         $this->longitude = $longitude;
     }