Index: src/wp-admin/custom-header.php
===================================================================
--- src/wp-admin/custom-header.php	(revision 40306)
+++ src/wp-admin/custom-header.php	(working copy)
@@ -1304,7 +1304,8 @@
 	}
 
 	/**
-	 *
+	 * This function is used for customize the header image. If the header image is alredy set then it will customize the last uploaded header image.
+	 * 
 	 * @param WP_Customize_Manager $wp_customize
 	 */
 	public function customize_set_last_used( $wp_customize ) {