diff --git a/composer.json b/composer.json
index 87f9ff6..ae73c08 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,8 @@
         "php": ">=5.3.0",
         "ext-xsl": "*",
         "ext-zip": "*",
-        "shadz3rg/lexer": "^1.0"
+        "ext-dom": "*",
+        "shadz3rg/lexer": "^1.0",
     },
     "authors": [
         {
diff --git a/src/PHPStamp/Templator.php b/src/PHPStamp/Templator.php
index d38accd..2dd58fd 100644
--- a/src/PHPStamp/Templator.php
+++ b/src/PHPStamp/Templator.php
@@ -42,6 +42,7 @@ class Templator
      *
      * @param string $cachePath Writable path to store compiled template.
      * @param array $brackets Customizable placeholder brackets.
+     * @throws Exception\InvalidArgumentException
      */
     public function __construct($cachePath, $brackets = array('[[', ']]'))
     {
@@ -65,6 +66,7 @@ public function __construct($cachePath, $brackets = array('[[', ']]'))
      * @param DocumentInterface $document Document to render.
      * @param array $values Multidimensional array with values to replace placeholders.
      * @return Result
+     * @throws Exception\InvalidArgumentException
      */
     public function render(DocumentInterface $document, array $values)
     {
@@ -88,6 +90,7 @@ public function render(DocumentInterface $document, array $values)
      *
      * @param DocumentInterface $document Document to render.
      * @return \DOMDocument XSL stylesheet.
+     * @throws Exception\InvalidArgumentException
      */
     private function getTemplate(DocumentInterface $document)
     {