diff --git a/README.md b/README.md
index bcf07f4..5db452b 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,26 @@ Further details can be found here:
 
 ## Slim 4 integration
 
+```php
+<?php
+
+use Selective\SameSiteCookie\SameSiteCookieMiddleware;
+use Slim\Factory\AppFactory;
+
+$app = AppFactory::create();
+
+// ...
+
+// Register the samesite cookie middleware
+$app->add(new SameSiteCookieMiddleware());
+
+// ...
+
+$app->run();
+```
+
+**Example with configuration and the session starter middleware.**
+
 Slim 4 uses a LIFO (last in, first out) middleware stack,
 so we have to add the middleware in reverse order:
 
@@ -57,6 +77,7 @@ $app = AppFactory::create();
 
 // ...
 
+// Optional: Add custom configuration
 $configuration = new SameSiteCookieConfiguration();
 
 // Register the samesite cookie middleware
diff --git a/src/SameSiteCookieMiddleware.php b/src/SameSiteCookieMiddleware.php
index 806598b..703dcaa 100644
--- a/src/SameSiteCookieMiddleware.php
+++ b/src/SameSiteCookieMiddleware.php
@@ -26,14 +26,14 @@ final class SameSiteCookieMiddleware implements MiddlewareInterface
     /**
      * The constructor.
      *
-     * @param SameSiteCookieConfiguration $configuration The configuration
+     * @param SameSiteCookieConfiguration|null $configuration The configuration
      * @param SessionHandlerInterface|null $sessionHandler The session handler
      */
     public function __construct(
-        SameSiteCookieConfiguration $configuration,
+        SameSiteCookieConfiguration $configuration = null,
         SessionHandlerInterface $sessionHandler = null
     ) {
-        $this->configuration = $configuration;
+        $this->configuration = $configuration ?: new SameSiteCookieConfiguration();
         $this->sessionHandler = $sessionHandler ?: new PhpSessionHandler();
     }