Index: src/wp-admin/customize.php
===================================================================
--- src/wp-admin/customize.php	(revision 25834)
+++ src/wp-admin/customize.php	(working copy)
@@ -44,7 +44,7 @@
 wp_enqueue_script( 'accordion' );
 
 /**
- * Fires when additional Customizer controls scripts are enqueued.
+ * Fires for enqueueing additional Customizer controls scripts.
  *
  * @since 3.4.0
  */
@@ -77,7 +77,7 @@
 ?><title><?php echo $admin_title; ?></title><?php
 
 /**
- * Fires when Customizer controls styles are printed.
+ * Fires for printing Customizer controls styles.
  *
  * @since 3.4.0
  */
@@ -84,7 +84,7 @@
 do_action( 'customize_controls_print_styles' );
 
 /**
- * Fires when Customizer controls scripts are printed.
+ * Fires for printing Customizer controls scripts.
  *
  * @since 3.4.0
  */
@@ -151,7 +151,7 @@
 	<?php
 
 	/**
-	 * Fires when Customizer controls footer scripts are printed.
+	 * Fires for printing Customizer controls footer scripts.
 	 *
 	 * @since 3.4.0
 	 */
@@ -172,6 +172,13 @@
 	if ( is_ssl() && ! $cross_domain )
 		$allowed_urls[] = home_url( '/', 'https' );
 
+	/**
+	 * Filter URLS that can be clicked, and will be followed, in the Customizer preview.
+	 *
+	 * @since 3.4.0
+	 *
+	 * @param array $allowed_urls An array of allowed URLs.
+	 */
 	$allowed_urls = array_unique( apply_filters( 'customize_allowed_urls', $allowed_urls ) );
 
 	$fallback_url = add_query_arg( array(