[doc] updated documentation

diff --git a/doc/04-Extending-Twig.markdown b/doc/04-Extending-Twig.markdown
index bb4a287..a8ad8d3 100644 (file)
--- a/doc/04-Extending-Twig.markdown
+++ b/doc/04-Extending-Twig.markdown
@@ -2,7 +2,7 @@ Extending Twig
 ==============
 
 Twig supports extensions that can add extra tags, filters, or even extend the
-parser itself with node transformer classes. The main motivation for writing
+parser itself with node visitor classes. The main motivation for writing
 an extension is to move often used code into a reusable class like adding
 support for internationalization.
 
@@ -13,6 +13,17 @@ to host all the specific tags and filters you want to add to Twig.
 >Before writing your own extensions, have a look at the Twig official extension
 >repository: http://github.com/fabpot/Twig-extensions.
 
+Extending without an Extension (new in Twig 0.9.7)
+--------------------------------------------------
+
+If you just need to register a small amount of tags and/or filters, you can
+register them without creating an extension:
+
+    [php]
+    $twig = new Twig_Environment($loader);
+    $twig->addTokenParser(new CustomTokenParser());
+    $twig->addFilter('upper', new Twig_Filter_Function('strtoupper'));
+
 Anatomy of an Extension
 -----------------------
 
@@ -36,11 +47,11 @@ An extension is a class that implements the following interface:
       public function getTokenParsers();
 
       /**
-       * Returns the node transformer instances to add to the existing list.
+       * Returns the node visitor instances to add to the existing list.
        *
-       * @return array An array of Twig_NodeTransformer instances
+       * @return array An array of Twig_NodeVisitorInterface instances
        */
-      public function getNodeTransformers();
+      public function getNodeVisitors();
 
       /**
        * Returns a list of filters to add to the existing list.
@@ -148,8 +159,16 @@ a string. Here is an example of its usage and the expected output:
 
     {# should displays Gjvt #}
 
-Adding a filter in an extension means overriding the `getFilters()` method.
-This method must return an array of filters to add to the Twig environment:
+Adding a filter is as simple as calling the `addFilter` method of the
+`Twig_Environment` instance (new in Twig 0.9.7):
+
+    [php]
+    $twig = new Twig_Environment($loader);
+    $twig->addFilter('upper', new Twig_Filter_Function('strtoupper'));
+
+To add a filter to an extension, you need to override the `getFilters()`
+method. This method must return an array of filters to add to the Twig
+environment:
 
     [php]
     class Project_Twig_Extension extends Twig_Extension