diff --git a/wp-includes/customize/class-wp-customize-partial.php b/wp-includes/customize/class-wp-customize-partial.php
index 458fa1ad9f..63b3eedc7c 100644
--- a/wp-includes/customize/class-wp-customize-partial.php
+++ b/wp-includes/customize/class-wp-customize-partial.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * WordPress Customize Partial class
+ * Customize API: WP_Customize_Partial class
  *
  * @package WordPress
  * @subpackage Customize
@@ -8,7 +8,7 @@
  */
 
 /**
- * Customize Partial class.
+ * Core Customizer class for implementing selective refresh partials.
  *
  * Representation of a rendered region in the previewed page that gets
  * selectively refreshed when an associated setting is changed.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9bfb53d29c..c3d17d9b20 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-beta3-37008';
+$wp_version = '4.5-beta3-37009';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.