diff --git a/src/Service/Exception/QRCodeGeneratorException.php b/src/Service/Exception/QRCodeGeneratorException.php
new file mode 100644
index 0000000..ab2fd68
--- /dev/null
+++ b/src/Service/Exception/QRCodeGeneratorException.php
@@ -0,0 +1,9 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Service\Exception;
+
+class QRCodeGeneratorException extends \RuntimeException
+{
+
+}
diff --git a/src/Service/QRCodeGeneratorInterface.php b/src/Service/QRCodeGeneratorInterface.php
index eb4b761..b9ec81f 100644
--- a/src/Service/QRCodeGeneratorInterface.php
+++ b/src/Service/QRCodeGeneratorInterface.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace App\Service;
 
 use App\Entity\QRCode\QRCode;
+use App\Service\Exception\QRCodeGeneratorException;
 
 interface QRCodeGeneratorInterface
 {
@@ -11,6 +12,7 @@ interface QRCodeGeneratorInterface
      * Generates QR code from entity
      * @param QRCode $entity
      * @return string base64 encoded PNG
+     * @throws QRCodeGeneratorException
      */
     public function generateQRCodeFromEntity(QRCode $entity): string;
 }