diff --git a/README.md b/README.md
index 929b6d7..c6954a0 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 ## RobotsBundle
 
-Add contextual robot meta headers.
+No need for robots.txt files,
+add contextual robot meta headers.
 
 ### Installation
 
@@ -20,5 +21,4 @@ dag_robots:
 
 ### TODO
 
-- [ ] Add route to serve robots.txt files dynamically.
 - [ ] Add tests
\ No newline at end of file
diff --git a/RobotsBundle/EventListener/KernelResponseListener.php b/RobotsBundle/EventListener/KernelResponseListener.php
index 83dfb14..dbc4a89 100644
--- a/RobotsBundle/EventListener/KernelResponseListener.php
+++ b/RobotsBundle/EventListener/KernelResponseListener.php
@@ -18,6 +18,11 @@ class KernelResponseListener
      */
     protected $tagResolver;
 
+    /**
+     * @var bool
+     */
+    protected $cloak = false;
+
     /**
      * @param RequestCheckerInterface $requestChecker
      * @param TagResolverInterface    $tagResolver
@@ -39,12 +44,12 @@ public function addRobotTags(FilterResponseEvent $event)
             return;
         }
 
-        // if (!$this->requestChecker->isCrawler($event->getRequest())) {
-        //     return;
-        // }
+        if ($this->cloak && !$this->requestChecker->isCrawler($event->getRequest())) {
+            return;
+        }
 
         if ($tags = $this->tagResolver->resolve($event->getRequest())) {
-            $event->getResponse()->headers->set('X-Robots-Tag', $tags);
+            $event->getResponse()->headers->set('X-Robots-Tag', implode(', ', $tags));
         }
     }
 }