diff --git a/Parser/MarkdownParser.php b/Parser/MarkdownParser.php
index 5f87217..a0e930f 100644
--- a/Parser/MarkdownParser.php
+++ b/Parser/MarkdownParser.php
@@ -2,7 +2,9 @@
 
 namespace Knplabs\Bundle\MarkdownBundle\Parser;
 
-require_once(realpath(__DIR__.'/..').'/vendor/parser/MarkdownExtraParser.php');
+if(!class_exists('\MarkdownExtraParser')) {
+    require_once(realpath(__DIR__.'/..').'/vendor/parser/MarkdownExtraParser.php');
+}
 
 /**
  * MarkdownParser
diff --git a/README.markdown b/README.markdown
index 70c8b33..e545932 100644
--- a/README.markdown
+++ b/README.markdown
@@ -24,7 +24,7 @@ You can also define your own Parser class :
 ## USAGE
 
     // Use the service
-    $html = $this->container['markdownParser']->transform($text);
+    $html = $this->container->get('markdownParser')->transform($text);
 
     // Use the helper
     echo $view['markdown']->transform($text);