diff --git a/Translation/Extractor/File/TwigFileExtractor.php b/Translation/Extractor/File/TwigFileExtractor.php
index a77e82fb..47c6e661 100644
--- a/Translation/Extractor/File/TwigFileExtractor.php
+++ b/Translation/Extractor/File/TwigFileExtractor.php
@@ -33,10 +33,21 @@ class TwigFileExtractor implements FileVisitorInterface, \Twig_NodeVisitorInterf
      * @var \SplFileInfo
      */
     private $file;
+
+    /**
+     * @var MessageCatalogue
+     */
     private $catalogue;
+
+    /**
+     * @var \Twig_NodeTraverser
+     */
     private $traverser;
+
+    /**
+     * @var \Twig_NodeInterface[]
+     */
     private $stack = array();
-    private $stackCount = 0;
 
     /**
      * @var LoggerInterface
@@ -91,13 +102,15 @@ public function enterNode(\Twig_NodeInterface $node, \Twig_Environment $env)
                 $message->addSource(new FileSource((string) $this->file, $node->getLine()));
 
                 for ($i=count($this->stack)-2; $i>=0; $i-=1) {
-                    if (!$this->stack[$i] instanceof \Twig_Node_Expression_Filter) {
+                    $currentNode = $this->stack[$i];
+
+                    if (!$currentNode instanceof \Twig_Node_Expression_Filter) {
                         break;
                     }
 
-                    $name = $this->stack[$i]->getNode('filter')->getAttribute('value');
+                    $name = $currentNode->getNode('filter')->getAttribute('value');
                     if ('desc' === $name || 'meaning' === $name) {
-                        $arguments = $this->stack[$i]->getNode('arguments');
+                        $arguments = $currentNode->getNode('arguments');
                         if (!$arguments->hasNode(0)) {
                             throw new RuntimeException(sprintf('The "%s" filter requires exactly one argument, the description text.', $name));
                         }
@@ -162,6 +175,11 @@ public function leaveNode(\Twig_NodeInterface $node, \Twig_Environment $env)
     public function visitFile(\SplFileInfo $file, MessageCatalogue $catalogue) { }
     public function visitPhpFile(\SplFileInfo $file, MessageCatalogue $catalogue, array $ast) { }
 
+    /**
+     * Inject a Logger
+     *
+     * @param LoggerInterface $logger
+     */
     public function setLogger(LoggerInterface $logger)
     {
         $this->logger = $logger;
@@ -170,6 +188,7 @@ public function setLogger(LoggerInterface $logger)
     /**
      * @param \Twig_Node $node
      * @return bool
+     * @throws RuntimeException
      */
     private function checkNodeIsConstant(\Twig_Node $node)
     {