diff --git a/lib/Twig/Template.php b/lib/Twig/Template.php
index 7f7f62a52..d64cfeb20 100644
--- a/lib/Twig/Template.php
+++ b/lib/Twig/Template.php
@@ -42,6 +42,15 @@ abstract class Twig_Template implements Twig_TemplateInterface
      */
     abstract public function getTemplateName();
 
+    /**
+     * Returns debug information about the template.
+     *
+     * @return array Debug information
+     *
+     * @internal
+     */
+    abstract public function getDebugInfo();
+
     /**
      * @deprecated since 1.20 (to be removed in 2.0)
      */