diff --git a/src/Message.php b/src/Message.php
index 53cac4f..a37fb9f 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -26,7 +26,7 @@
 class Message implements MessageInterface{
 
 	protected StreamInterface $body;
-	/** @var array<string, string|string[]>  */
+	/** @var array<string, array{name: string, value: string[]}>  */
 	protected array           $headers = [];
 	protected string          $version = '1.1';
 
diff --git a/src/ServerRequest.php b/src/ServerRequest.php
index f6c0311..691f039 100644
--- a/src/ServerRequest.php
+++ b/src/ServerRequest.php
@@ -35,7 +35,7 @@ class ServerRequest extends Request implements ServerRequestInterface{
 	/**
 	 * ServerRequest constructor.
 	 *
-	 * @param array<string, string>|nul $serverParams
+	 * @param array<string, string>|null $serverParams
 	 */
 	public function __construct(string $method, UriInterface|string $uri, array|null $serverParams = null){
 		parent::__construct($method, $uri);