diff --git a/src/Model/UploadModel.php b/src/Model/UploadModel.php
index 02f632b..2b3cdc8 100644
--- a/src/Model/UploadModel.php
+++ b/src/Model/UploadModel.php
@@ -3,7 +3,6 @@
 namespace VC4A\Model;
 
 use InvalidArgumentException;
-use VC4A\Model\DocumentsModel;
 
 class UploadModel extends ModelAbstract
 {
@@ -44,6 +43,7 @@ public function create(array $data): array
 
     /**
      * @return array
+     * @throws InvalidArgumentException
      */
     public function validate(array $data): array
     {
@@ -60,6 +60,7 @@ public function validate(array $data): array
     /**
      * @param array $data
      * @return array
+     * @throws InvalidArgumentException
      */
     public function sanitize(array $data) : array
     {
diff --git a/src/Repository/MySQLRepositoryAbstract.php b/src/Repository/MySQLRepositoryAbstract.php
index c1c58d1..ae611b9 100644
--- a/src/Repository/MySQLRepositoryAbstract.php
+++ b/src/Repository/MySQLRepositoryAbstract.php
@@ -9,6 +9,9 @@
 
 abstract class MySQLRepositoryAbstract implements MySQLRepositoryInterface
 {
+    /** @var PDO */
+    private $pdo;
+
     /**
      * @param PDO $pdo
      */
diff --git a/src/Repository/UploadRepository.php b/src/Repository/UploadRepository.php
index 6b24cf7..8f9fe76 100644
--- a/src/Repository/UploadRepository.php
+++ b/src/Repository/UploadRepository.php
@@ -3,6 +3,7 @@
 namespace VC4A\Repository;
 
 use Exception;
+use RuntimeException;
 
 class UploadRepository implements RepositoryInterface
 {
@@ -12,6 +13,7 @@ class UploadRepository implements RepositoryInterface
     /**
      * @param array $data
      * @return array
+     * @throws Exception
      */
     public function create(array $data): array
     {
@@ -32,8 +34,12 @@ protected function moveUploadedFile(string $from, string $to): bool
         return move_uploaded_file($from, self::UPLOADS_DIR . basename($to));
     }
 
+    /**
+     * @return array
+     * @throws RuntimeException
+     */
     public function all(): array
     {
-        throw new Exception('Method not implemented');
+        throw new RuntimeException('Method not implemented');
     }
 }