Index: src/wp-admin/includes/class-automatic-upgrader-skin.php
===================================================================
--- src/wp-admin/includes/class-automatic-upgrader-skin.php	(revision 43435)
+++ src/wp-admin/includes/class-automatic-upgrader-skin.php	(working copy)
@@ -101,6 +101,7 @@
 	}
 
 	/**
+	 * The header will help to create new output buffering and start write to it.
 	 */
 	public function header() {
 		ob_start();
@@ -107,6 +108,7 @@
 	}
 
 	/**
+	 * The footer will help to get current buffering output and delete current output buffer. 
 	 */
 	public function footer() {
 		$output = ob_get_clean();