diff --git a/Embryo/Http/Server/RequestHandler.php b/Embryo/Http/Server/RequestHandler.php
index cf10b5a..9c3b6cd 100644
--- a/Embryo/Http/Server/RequestHandler.php
+++ b/Embryo/Http/Server/RequestHandler.php
@@ -29,7 +29,7 @@ class RequestHandler implements RequestHandlerInterface
         protected $middleware = [];
         
         /**
-         * @var array $middleware 
+         * @var ResponseInterface $response 
          */
         protected $response;
 
@@ -46,7 +46,9 @@ public function __construct(array $middleware = [])
         /**
          * Add a middleware to the end of the queue.
          *
-         * @param string|MiddlewareInterface $middleware 
+         * @param string|MiddlewareInterface $middleware
+         * @return void 
+         * @throws \InvalidArgumentException 
          */
         public function add($middleware)
         {
@@ -62,6 +64,8 @@ public function add($middleware)
          * Add a middleware to the beginning of the queue.
          *
          * @param string|MiddlewareInterface $middleware 
+         * @return void 
+         * @throws \InvalidArgumentException  
          */
         public function prepend($middleware)
         {
@@ -78,6 +82,7 @@ public function prepend($middleware)
          * 
          * @param ServerRequestInterface $request 
          * @param ResponseInterface $response
+         * @return ResponseInterface
          */
         public function dispatch(ServerRequestInterface $request, ResponseInterface $response): ResponseInterface
         {
diff --git a/composer.json b/composer.json
index d1dd04b..7ae1869 100644
--- a/composer.json
+++ b/composer.json
@@ -17,12 +17,13 @@
     "require": {
         "php": ">=7.1",
         "psr/http-server-handler": "1.0.0",
-        "psr/http-server-middleware": "1.0.0"
+        "psr/http-server-middleware": "1.0.0",
+        "davidecesarano/embryo-http": "dev-master"
     },
     "require-dev": {
-        "davidecesarano/embryo-http": "dev-master",
         "middlewares/response-time": "v1.0.0",
-        "middlewares/uuid": "v1.0.0"
+        "middlewares/uuid": "v1.0.0",
+        "phpstan/phpstan": "^0.12.55"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..1ad9dc8
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,8 @@
+parameters:
+	checkMissingIterableValueType: false
+	treatPhpDocTypesAsCertain: false
+	checkGenericClassInNonGenericObjectType: false
+	level: max
+	paths:
+		- Embryo
+		- example
\ No newline at end of file