diff --git a/Classes/Example/Register.php b/Classes/Example/Register.php
index bb34a42218be4468cbc46382e7a1a7286673ffee..5f0f2c3280115215a226122d3cc97096a5b5588e 100644
--- a/Classes/Example/Register.php
+++ b/Classes/Example/Register.php
@@ -2,8 +2,6 @@
 
 namespace SGalinski\SgMail\Example;
 
-use SGalinski\SgMail\Service\RegisterInterface;
-
 /***************************************************************
  *  Copyright notice
  *
@@ -28,6 +26,8 @@ use SGalinski\SgMail\Service\RegisterInterface;
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
 
+use SGalinski\SgMail\Service\RegisterInterface;
+
 /**
  * Example Registration for a Template
  *
@@ -73,8 +73,6 @@ class Register implements RegisterInterface {
 
 	/**
 	 * initialize certain values
-	 *
-	 * @return mixed
 	 */
 	public function init() {
 		$this->markers = [
@@ -103,9 +101,7 @@ class Register implements RegisterInterface {
 	}
 
 	/**
-	 * call MailTemplateService registerTemplate with according values
-	 *
-	 * @return mixed
+	 * Calls MailTemplateService registerTemplate with according values.
 	 */
 	public function registerTemplate() {
 		\SGalinski\SgMail\Service\MailTemplateService::registerTemplate(
@@ -124,7 +120,7 @@ class Register implements RegisterInterface {
 	 * @param array $markers
 	 * @return RegisterInterface
 	 */
-	public function setMarkers($markers) {
+	public function setMarkers(array $markers) {
 		$this->markers = $markers;
 		return $this;
 	}
@@ -140,7 +136,7 @@ class Register implements RegisterInterface {
 	 * @param array $subjects
 	 * @return RegisterInterface
 	 */
-	public function setSubjects($subjects) {
+	public function setSubjects(array $subjects) {
 		$this->subjects = $subjects;
 		return $this;
 	}