diff --git a/core/lib/Drupal/Core/Theme/Registry.php b/core/lib/Drupal/Core/Theme/Registry.php
index dd2d0bc..ba7f433 100644
--- a/core/lib/Drupal/Core/Theme/Registry.php
+++ b/core/lib/Drupal/Core/Theme/Registry.php
@@ -32,7 +32,7 @@ class Registry implements DestructableInterface {
    *
    * @var array
    */
-  protected $base_themes;
+  protected $baseThemes;
 
   /**
    * The name of the theme engine of $theme.
@@ -109,7 +109,7 @@ class Registry implements DestructableInterface {
 
 
   /**
-   * Constructs a new theme registry instance.
+   * Constructs a \Drupal\Core\\Theme\Registry object.
    *
    * @param \Drupal\Core\Cache\CacheBackendInterface $cache
    *   The cache backend interface to use for the complete theme registry data.
@@ -125,7 +125,10 @@ public function __construct(CacheBackendInterface $cache, ModuleHandlerInterface
   }
 
   /**
-   * DIE.
+   * Initializes a theme with a certain name.
+   *
+   * This function does to much magic, so it should be replaced by another
+   * services which holds the current active theme information.
    *
    * @param string $theme_name
    *   (optional) The name of the theme for which to construct the registry.
@@ -174,7 +177,7 @@ protected function init($theme_name = NULL) {
         drupal_theme_initialize();
       }
       $this->theme = $GLOBALS['theme_info'];
-      $this->base_themes = $GLOBALS['base_theme_info'];
+      $this->baseThemes = $GLOBALS['base_theme_info'];
       $this->engine = $GLOBALS['theme_engine'];
     }
     // Instead of the global theme, a specific theme was requested.
@@ -184,23 +187,23 @@ protected function init($theme_name = NULL) {
       $this->theme = $themes[$theme_name];
 
       // Find all base themes.
-      $this->base_themes = array();
+      $this->baseThemes = array();
       $ancestor = $theme_name;
       while ($ancestor && isset($themes[$ancestor]->base_theme)) {
         $ancestor = $themes[$ancestor]->base_theme;
-        $this->base_themes[] = $themes[$ancestor];
+        $this->baseThemes[] = $themes[$ancestor];
         if (!empty($themes[$ancestor]->owner)) {
           include_once DRUPAL_ROOT . '/' . $themes[$ancestor]->owner;
         }
       }
-      $this->base_themes = array_reverse($this->base_themes);
+      $this->baseThemes = array_reverse($this->baseThemes);
 
       // @see _drupal_theme_initialize()
       if (isset($this->theme->engine)) {
         $this->engine = $this->theme->engine;
         include_once DRUPAL_ROOT . '/' . $this->theme->owner;
         if (function_exists($this->theme->engine . '_init')) {
-          foreach ($this->base_themes as $base) {
+          foreach ($this->baseThemes as $base) {
             call_user_func($this->theme->engine . '_init', $base);
           }
           call_user_func($this->theme->engine . '_init', $this->theme);
@@ -306,7 +309,7 @@ protected function build() {
     }
 
     // Process each base theme.
-    foreach ($this->base_themes as $base) {
+    foreach ($this->baseThemes as $base) {
       // If the base theme uses a theme engine, process its hooks.
       $base_path = dirname($base->uri);
       if ($this->engine) {