diff --git a/best_practices/templates.rst b/best_practices/templates.rst
index d47c6a1c48d..402f4fd2898 100644
--- a/best_practices/templates.rst
+++ b/best_practices/templates.rst
@@ -51,6 +51,10 @@ Another advantage is that centralizing your templates simplifies the work
 of your designers. They don't need to look for templates in lots of directories
 scattered through lots of bundles.
 
+.. best-practice::
+
+    Use lowercased snake_case for directory and template names.
+
 Twig Extensions
 ---------------
 
diff --git a/book/controller.rst b/book/controller.rst
index 942d5a5baab..06124fcadc0 100644
--- a/book/controller.rst
+++ b/book/controller.rst
@@ -471,14 +471,14 @@ If you're serving HTML, you'll want to render a template. The ``render()``
 method renders a template **and** puts that content into a ``Response``
 object for you::
 
-    // renders app/Resources/views/Hello/index.html.twig
-    return $this->render('Hello/index.html.twig', array('name' => $name));
+    // renders app/Resources/views/hello/index.html.twig
+    return $this->render('hello/index.html.twig', array('name' => $name));
 
 You can also put templates in deeper sub-directories. Just try to avoid creating
 unnecessarily deep structures::
 
-    // renders app/Resources/views/Hello/Greetings/index.html.twig
-    return $this->render('Hello/Greetings/index.html.twig', array('name' => $name));
+    // renders app/Resources/views/hello/greetings/index.html.twig
+    return $this->render('hello/greetings/index.html.twig', array('name' => $name));
 
 The Symfony templating engine is explained in great detail in the
 :doc:`Templating </book/templating>` chapter.
diff --git a/book/forms.rst b/book/forms.rst
index 48093e75efb..b53384d779e 100644
--- a/book/forms.rst
+++ b/book/forms.rst
@@ -96,7 +96,7 @@ from inside a controller::
                 ->add('save', 'submit', array('label' => 'Create Task'))
                 ->getForm();
 
-            return $this->render('Default/new.html.twig', array(
+            return $this->render('default/new.html.twig', array(
                 'form' => $form->createView(),
             ));
         }
@@ -144,14 +144,14 @@ helper functions:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Default/new.html.twig #}
+        {# app/Resources/views/default/new.html.twig #}
         {{ form_start(form) }}
         {{ form_widget(form) }}
         {{ form_end(form) }}
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Default/new.html.php -->
+        <!-- app/Resources/views/default/new.html.php -->
         <?php echo $view['form']->start($form) ?>
         <?php echo $view['form']->widget($form) ?>
         <?php echo $view['form']->end($form) ?>
@@ -442,12 +442,12 @@ corresponding errors printed out with the form.
 
        .. code-block:: html+jinja
 
-           {# app/Resources/views/Default/new.html.twig #}
+           {# app/Resources/views/default/new.html.twig #}
            {{ form(form, {'attr': {'novalidate': 'novalidate'}}) }}
 
        .. code-block:: html+php
 
-           <!-- app/Resources/views/Default/new.html.php -->
+           <!-- app/Resources/views/default/new.html.php -->
            <?php echo $view['form']->form($form, array(
                'attr' => array('novalidate' => 'novalidate'),
            )) ?>
@@ -784,7 +784,7 @@ of code. Of course, you'll usually need much more flexibility when rendering:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Default/new.html.twig #}
+        {# app/Resources/views/default/new.html.twig #}
         {{ form_start(form) }}
             {{ form_errors(form) }}
 
@@ -794,7 +794,7 @@ of code. Of course, you'll usually need much more flexibility when rendering:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Default/newAction.html.php -->
+        <!-- app/Resources/views/default/newAction.html.php -->
         <?php echo $view['form']->start($form) ?>
             <?php echo $view['form']->errors($form) ?>
 
@@ -1002,12 +1002,12 @@ to the ``form()`` or the ``form_start()`` helper:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Default/new.html.twig #}
+        {# app/Resources/views/default/new.html.twig #}
         {{ form_start(form, {'action': path('target_route'), 'method': 'GET'}) }}
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Default/newAction.html.php -->
+        <!-- app/Resources/views/default/newAction.html.php -->
         <?php echo $view['form']->start($form, array(
             'action' => $view['router']->generate('target_route'),
             'method' => 'GET',
@@ -1437,7 +1437,7 @@ do this, create a new template file that will store the new markup:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Form/fields.html.twig #}
+        {# app/Resources/views/form/fields.html.twig #}
         {% block form_row %}
         {% spaceless %}
             <div class="form_row">
@@ -1450,7 +1450,7 @@ do this, create a new template file that will store the new markup:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Form/form_row.html.php -->
+        <!-- app/Resources/views/form/form_row.html.php -->
         <div class="form_row">
             <?php echo $view['form']->label($form, $label) ?>
             <?php echo $view['form']->errors($form) ?>
@@ -1466,19 +1466,19 @@ renders the form:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Default/new.html.twig #}
-        {% form_theme form 'Form/fields.html.twig' %}
+        {# app/Resources/views/default/new.html.twig #}
+        {% form_theme form 'form/fields.html.twig' %}
 
-        {% form_theme form 'Form/fields.html.twig' 'Form/fields2.html.twig' %}
+        {% form_theme form 'form/fields.html.twig' 'Form/fields2.html.twig' %}
 
         {# ... render the form #}
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Default/new.html.php -->
-        <?php $view['form']->setTheme($form, array('Form')) ?>
+        <!-- app/Resources/views/default/new.html.php -->
+        <?php $view['form']->setTheme($form, array('form')) ?>
 
-        <?php $view['form']->setTheme($form, array('Form', 'Form2')) ?>
+        <?php $view['form']->setTheme($form, array('form', 'form2')) ?>
 
         <!-- ... render the form -->
 
@@ -1606,7 +1606,7 @@ file:
         twig:
             form:
                 resources:
-                    - 'Form/fields.html.twig'
+                    - 'form/fields.html.twig'
             # ...
 
     .. code-block:: xml
@@ -1621,7 +1621,7 @@ file:
 
             <twig:config>
                 <twig:form>
-                    <twig:resource>Form/fields.html.twig</twig:resource>
+                    <twig:resource>form/fields.html.twig</twig:resource>
                 </twig:form>
                 <!-- ... -->
             </twig:config>
@@ -1633,7 +1633,7 @@ file:
         $container->loadFromExtension('twig', array(
             'form' => array(
                 'resources' => array(
-                    'Form/fields.html.twig',
+                    'form/fields.html.twig',
                 ),
             ),
             // ...
diff --git a/book/from_flat_php_to_symfony2.rst b/book/from_flat_php_to_symfony2.rst
index 364546977c9..37bd6d8ecd0 100644
--- a/book/from_flat_php_to_symfony2.rst
+++ b/book/from_flat_php_to_symfony2.rst
@@ -710,7 +710,7 @@ for example, the list template written in Twig:
 
 .. code-block:: html+jinja
 
-    {# app/Resources/views/Blog/list.html.twig #}
+    {# app/Resources/views/blog/list.html.twig #}
     {% extends "layout.html.twig" %}
 
     {% block title %}List of Posts{% endblock %}
diff --git a/book/http_cache.rst b/book/http_cache.rst
index d01f999877e..f550c5cdb23 100644
--- a/book/http_cache.rst
+++ b/book/http_cache.rst
@@ -732,7 +732,7 @@ exposing a simple and efficient pattern::
             $comments = ...;
 
             // or render a template with the $response you've already started
-            return $this->render('Article/show.html.twig', array(
+            return $this->render('article/show.html.twig', array(
                 'article' => $article,
                 'comments' => $comments
             ), $response);
diff --git a/book/templating.rst b/book/templating.rst
index 4b003e8bad6..f30c2356ee1 100644
--- a/book/templating.rst
+++ b/book/templating.rst
@@ -263,7 +263,7 @@ A child template might look like this:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Blog/index.html.twig #}
+        {# app/Resources/views/blog/index.html.twig #}
         {% extends 'base.html.twig' %}
 
         {% block title %}My cool blog posts{% endblock %}
@@ -277,7 +277,7 @@ A child template might look like this:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Blog/index.html.php -->
+        <!-- app/Resources/views/blog/index.html.php -->
         <?php $view->extend('base.html.php') ?>
 
         <?php $view['slots']->set('title', 'My cool blog posts') ?>
@@ -399,8 +399,8 @@ Most of the templates you'll use live in the ``app/Resources/views/``
 directory. The path you'll use will be relative to this directory. For example,
 to render/extend ``app/Resources/views/base.html.twig``, you'll use the
 ``base.html.twig`` path and to render/extend
-``app/Resources/views/Blog/index.html.twig``, you'll use the
-``Blog/index.html.twig`` path.
+``app/Resources/views/blog/index.html.twig``, you'll use the
+``blog/index.html.twig`` path.
 
 .. _template-referencing-in-bundle:
 
@@ -453,9 +453,9 @@ Every template name also has two extensions that specify the *format* and
 ========================  ======  ======
 Filename                  Format  Engine
 ========================  ======  ======
-``Blog/index.html.twig``  HTML    Twig
-``Blog/index.html.php``   HTML    PHP
-``Blog/index.css.twig``   CSS     Twig
+``blog/index.html.twig``  HTML    Twig
+``blog/index.html.php``   HTML    PHP
+``blog/index.css.twig``   CSS     Twig
 ========================  ======  ======
 
 By default, any Symfony template can be written in either Twig or PHP, and
@@ -518,7 +518,7 @@ template. First, create the template that you'll need to reuse.
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Article/articleDetails.html.twig #}
+        {# app/Resources/views/article/article_details.html.twig #}
         <h2>{{ article.title }}</h2>
         <h3 class="byline">by {{ article.authorName }}</h3>
 
@@ -528,7 +528,7 @@ template. First, create the template that you'll need to reuse.
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Article/articleDetails.html.php -->
+        <!-- app/Resources/views/article/article_details.html.php -->
         <h2><?php echo $article->getTitle() ?></h2>
         <h3 class="byline">by <?php echo $article->getAuthorName() ?></h3>
 
@@ -542,20 +542,20 @@ Including this template from any other template is simple:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Article/list.html.twig #}
+        {# app/Resources/views/article/list.html.twig #}
         {% extends 'layout.html.twig' %}
 
         {% block body %}
             <h1>Recent Articles<h1>
 
             {% for article in articles %}
-                {{ include('Article/articleDetails.html.twig', { 'article': article }) }}
+                {{ include('article/article_details.html.twig', { 'article': article }) }}
             {% endfor %}
         {% endblock %}
 
     .. code-block:: html+php
 
-        <!-- app/Resources/Article/list.html.php -->
+        <!-- app/Resources/article/list.html.php -->
         <?php $view->extend('layout.html.php') ?>
 
         <?php $view['slots']->start('body') ?>
@@ -563,17 +563,17 @@ Including this template from any other template is simple:
 
             <?php foreach ($articles as $article): ?>
                 <?php echo $view->render(
-                    'Article/articleDetails.html.php',
+                    'Article/article_details.html.php',
                     array('article' => $article)
                 ) ?>
             <?php endforeach ?>
         <?php $view['slots']->stop() ?>
 
 The template is included using the ``{{ include() }}`` function. Notice that the
-template name follows the same typical convention. The ``articleDetails.html.twig``
+template name follows the same typical convention. The ``article_details.html.twig``
 template uses an ``article`` variable, which we pass to it. In this case,
 you could avoid doing this entirely, as all of the variables available in
-``list.html.twig`` are also available in ``articleDetails.html.twig`` (unless
+``list.html.twig`` are also available in ``article_details.html.twig`` (unless
 you set `with_context`_ to false).
 
 .. tip::
@@ -617,7 +617,7 @@ articles::
             $articles = ...;
 
             return $this->render(
-                'Article/recentList.html.twig',
+                'article/recent_list.html.twig',
                 array('articles' => $articles)
             );
         }
@@ -629,7 +629,7 @@ The ``recentList`` template is perfectly straightforward:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Article/recentList.html.twig #}
+        {# app/Resources/views/article/recent_list.html.twig #}
         {% for article in articles %}
             <a href="/article/{{ article.slug }}">
                 {{ article.title }}
@@ -638,7 +638,7 @@ The ``recentList`` template is perfectly straightforward:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Article/recentList.html.php -->
+        <!-- app/Resources/views/article/recent_list.html.php -->
         <?php foreach ($articles as $article): ?>
             <a href="/article/<?php echo $article->getSlug() ?>">
                 <?php echo $article->getTitle() ?>
@@ -812,7 +812,7 @@ any global default template that is defined):
     .. code-block:: jinja
 
         {{ render_hinclude(controller('...'),  {
-            'default': 'Default/content.html.twig'
+            'default': 'default/content.html.twig'
         }) }}
 
     .. code-block:: php
@@ -821,7 +821,7 @@ any global default template that is defined):
             new ControllerReference('...'),
             array(
                 'renderer' => 'hinclude',
-                'default' => 'Default/content.html.twig',
+                'default' => 'default/content.html.twig',
             )
         ) ?>
 
@@ -957,7 +957,7 @@ correctly:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Article/recentList.html.twig #}
+        {# app/Resources/views/article/recent_list.html.twig #}
         {% for article in articles %}
             <a href="{{ path('article_show', {'slug': article.slug}) }}">
                 {{ article.title }}
@@ -966,7 +966,7 @@ correctly:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Article/recentList.html.php -->
+        <!-- app/Resources/views/Article/recent_list.html.php -->
         <?php foreach ($articles in $article): ?>
             <a href="<?php echo $view['router']->generate('article_show', array(
                 'slug' => $article->getSlug(),
@@ -1086,7 +1086,7 @@ page. From inside that contact page's template, do the following:
 
 .. code-block:: html+jinja
 
-    {# app/Resources/views/Contact/contact.html.twig #}
+    {# app/Resources/views/contact/contact.html.twig #}
     {% extends 'base.html.twig' %}
 
     {% block stylesheets %}
@@ -1171,14 +1171,14 @@ This special object is responsible for rendering templates and returning
 their content. When you render a template in a controller, for example,
 you're actually using the templating engine service. For example::
 
-    return $this->render('Article/index.html.twig');
+    return $this->render('article/index.html.twig');
 
 is equivalent to::
 
     use Symfony\Component\HttpFoundation\Response;
 
     $engine = $this->container->get('templating');
-    $content = $engine->render('Article/index.html.twig');
+    $content = $engine->render('article/index.html.twig');
 
     return $response = new Response($content);
 
@@ -1334,12 +1334,12 @@ covered:
   template is called ``base.html.twig``;
 
 * Create a template for each "section" of your site. For example, the blog
-  functionality would have a template called ``Blog/layout.html.twig`` that
+  functionality would have a template called ``blog/layout.html.twig`` that
   contains only blog section-specific elements;
 
   .. code-block:: html+jinja
 
-      {# app/Resources/views/Blog/layout.html.twig #}
+      {# app/Resources/views/blog/layout.html.twig #}
       {% extends 'base.html.twig' %}
 
       {% block body %}
@@ -1350,12 +1350,12 @@ covered:
 
 * Create individual templates for each page and make each extend the appropriate
   section template. For example, the "index" page would be called something
-  close to ``Blog/index.html.twig`` and list the actual blog posts.
+  close to ``blog/index.html.twig`` and list the actual blog posts.
 
   .. code-block:: html+jinja
 
-      {# app/Resources/views/Blog/index.html.twig #}
-      {% extends 'Blog/layout.html.twig' %}
+      {# app/Resources/views/blog/index.html.twig #}
+      {% extends 'blog/layout.html.twig' %}
 
       {% block content %}
           {% for entry in blog_entries %}
@@ -1364,7 +1364,7 @@ covered:
           {% endfor %}
       {% endblock %}
 
-Notice that this template extends the section template (``Blog/layout.html.twig``)
+Notice that this template extends the section template (``blog/layout.html.twig``)
 which in turn extends the base application layout (``base.html.twig``). This is
 the common three-level inheritance model.
 
@@ -1485,7 +1485,7 @@ Template parameters can then be dumped using the ``dump`` function:
 
 .. code-block:: html+jinja
 
-    {# app/Resources/views/Article/recentList.html.twig #}
+    {# app/Resources/views/article/recent_list.html.twig #}
     {{ dump(articles) }}
 
     {% for article in articles %}
@@ -1507,7 +1507,7 @@ console command:
 .. code-block:: bash
 
     # You can check by filename:
-    $ php app/console twig:lint app/Resources/views/Article/recentList.html.twig
+    $ php app/console twig:lint app/Resources/views/article/recent_list.html.twig
 
     # or by directory:
     $ php app/console twig:lint app/Resources/views
@@ -1525,7 +1525,7 @@ For example, the same "resource" is often rendered in several formats.
 To render an article index page in XML, simply include the format in the
 template name:
 
-* *XML template name*: ``Article/index.xml.twig``
+* *XML template name*: ``article/index.xml.twig``
 * *XML template filename*: ``index.xml.twig``
 
 In reality, this is nothing more than a naming convention and the template
@@ -1539,7 +1539,7 @@ pattern is to do the following::
     {
         $format = $request->getRequestFormat();
 
-        return $this->render('Blog/index.'.$format.'.twig');
+        return $this->render('article/index.'.$format.'.twig');
     }
 
 The ``getRequestFormat`` on the ``Request`` object defaults to ``html``,
@@ -1579,7 +1579,7 @@ their use is not mandatory. The ``Response`` object returned by a controller
 can be created with or without the use of a template::
 
     // creates a Response object whose content is the rendered template
-    $response = $this->render('Article/index.html.twig');
+    $response = $this->render('article/index.html.twig');
 
     // creates a Response object whose content is simple text
     $response = new Response('response content');
diff --git a/book/validation.rst b/book/validation.rst
index 4797d160ebb..92958ee094c 100644
--- a/book/validation.rst
+++ b/book/validation.rst
@@ -166,7 +166,7 @@ will appear.
 You could also pass the collection of errors into a template::
 
     if (count($errors) > 0) {
-        return $this->render('Author/validation.html.twig', array(
+        return $this->render('author/validation.html.twig', array(
             'errors' => $errors,
         ));
     }
@@ -177,7 +177,7 @@ Inside the template, you can output the list of errors exactly as needed:
 
     .. code-block:: html+jinja
 
-        {# app/Resources/views/Author/validation.html.twig #}
+        {# app/Resources/views/author/validation.html.twig #}
         <h3>The author has the following errors</h3>
         <ul>
         {% for error in errors %}
@@ -187,7 +187,7 @@ Inside the template, you can output the list of errors exactly as needed:
 
     .. code-block:: html+php
 
-        <!-- app/Resources/views/Author/validation.html.php -->
+        <!-- app/Resources/views/author/validation.html.php -->
         <h3>The author has the following errors</h3>
         <ul>
         <?php foreach ($errors as $error): ?>
@@ -235,7 +235,7 @@ workflow looks like the following from inside a controller::
             return $this->redirect($this->generateUrl(...));
         }
 
-        return $this->render('Author/form.html.twig', array(
+        return $this->render('author/form.html.twig', array(
             'form' => $form->createView(),
         ));
     }