Index: wp-admin/includes/screen.php
===================================================================
--- wp-admin/includes/screen.php	(revision 18859)
+++ wp-admin/includes/screen.php	(working copy)
@@ -797,6 +797,11 @@
 		<?php
 	}
 
+	/**
+	 * Render the option for number of Columns on the page
+	 *
+	 * @since 3.3.0
+	 */
 	function render_screen_layout() {
 		global $screen_layout_columns;
 
@@ -843,6 +848,11 @@
 		<?php
 	}
 
+	/**
+	 * Render the items per page option
+	 *
+	 * @since 3.3.0
+	 */
 	function render_per_page_options() {
 		if ( ! isset( $this->_options['per_page'] ) )
 			return;