diff --git a/src/Hydrator/ArrayHydrator.php b/src/Hydrator/ArrayHydrator.php
index 5b453e4..9c49601 100644
--- a/src/Hydrator/ArrayHydrator.php
+++ b/src/Hydrator/ArrayHydrator.php
@@ -22,6 +22,8 @@ use Psr\Http\Message\ResponseInterface;
 final class ArrayHydrator implements Hydrator
 {
     /**
+     * @phpstan-param class-string $class
+     *
      * @return array
      */
     public function hydrate(ResponseInterface $response, string $class)
diff --git a/src/Hydrator/Hydrator.php b/src/Hydrator/Hydrator.php
index 6819dc3..f6df687 100644
--- a/src/Hydrator/Hydrator.php
+++ b/src/Hydrator/Hydrator.php
@@ -20,6 +20,8 @@ use Psr\Http\Message\ResponseInterface;
 interface Hydrator
 {
     /**
+     * @phpstan-param class-string $class
+     *
      * @throws HydrationException
      */
     public function hydrate(ResponseInterface $response, string $class);
diff --git a/src/Hydrator/NoopHydrator.php b/src/Hydrator/NoopHydrator.php
index 72ad2ed..ae5f030 100644
--- a/src/Hydrator/NoopHydrator.php
+++ b/src/Hydrator/NoopHydrator.php
@@ -21,6 +21,8 @@ use Psr\Http\Message\ResponseInterface;
 final class NoopHydrator implements Hydrator
 {
     /**
+     * @phpstan-param class-string $class
+     *
      * @throws \LogicException
      */
     public function hydrate(ResponseInterface $response, string $class)