diff --git a/lib/Twig/Loader.php b/lib/Twig/Loader.php
index 78759c19f..c87bc0a5d 100644
--- a/lib/Twig/Loader.php
+++ b/lib/Twig/Loader.php
@@ -98,6 +98,11 @@ abstract class Twig_Loader implements Twig_LoaderInterface
     return $cls;
   }
 
+  /**
+   * Sets the Environment related to this loader.
+   *
+   * @param Twig_Environment $env A Twig_Environment instance
+   */
   public function setEnvironment(Twig_Environment $env)
   {
     $this->env = $env;
diff --git a/lib/Twig/LoaderInterface.php b/lib/Twig/LoaderInterface.php
index 678000352..4682f083e 100644
--- a/lib/Twig/LoaderInterface.php
+++ b/lib/Twig/LoaderInterface.php
@@ -26,4 +26,11 @@ interface Twig_LoaderInterface
    * @return string The class name of the compiled template
    */
   public function load($name);
+
+  /**
+   * Sets the Environment related to this loader.
+   *
+   * @param Twig_Environment $env A Twig_Environment instance
+   */
+  public function setEnvironment(Twig_Environment $env);
 }