Index: src/wp-includes/widgets/class-wp-widget-recent-comments.php
===================================================================
--- src/wp-includes/widgets/class-wp-widget-recent-comments.php	(revision 34549)
+++ src/wp-includes/widgets/class-wp-widget-recent-comments.php	(working copy)
@@ -16,6 +16,12 @@
  */
 class WP_Widget_Recent_Comments extends WP_Widget {
 
+	/**
+	 * PHP5 constructor.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 */
 	public function __construct() {
 		$widget_ops = array('classname' => 'widget_recent_comments', 'description' => __( 'Your site’s most recent comments.' ) );
 		parent::__construct('recent-comments', __('Recent Comments'), $widget_ops);
@@ -25,7 +31,10 @@
 			add_action( 'wp_head', array($this, 'recent_comments_style') );
 	}
 
-	/**
+ 	/**
+	 * Outputs the Recent Comments default widget styles.
+	 *
+	 * @since 3.1.0
 	 * @access public
 	 */
 	public function recent_comments_style() {
@@ -46,8 +55,14 @@
 	}
 
 	/**
-	 * @param array $args
-	 * @param array $instance
+	 * Echoes the widget content.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 *
+	 * @param array $args     Display arguments including 'before_title', 'after_title',
+	 *                        'before_widget', and 'after_widget'.
+	 * @param array $instance The settings for the particular instance of the widget.
 	 */
 	public function widget( $args, $instance ) {
 		if ( ! isset( $args['widget_id'] ) )
@@ -107,9 +122,19 @@
 	}
 
 	/**
-	 * @param array $new_instance
-	 * @param array $old_instance
-	 * @return array
+	 * Updates a particular instance of a widget.
+	 *
+	 * This function should check that `$new_instance` is set correctly. The newly-calculated
+	 * value of `$instance` should be returned. If false is returned, the instance won't be
+	 * saved/updated.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 *
+	 * @param array $new_instance New settings for this instance as input by the user via
+	 *                            WP_Widget::form().
+	 * @param array $old_instance Old settings for this instance.
+	 * @return array Settings to save or bool false to cancel saving.
 	 */
 	public function update( $new_instance, $old_instance ) {
 		$instance = $old_instance;
@@ -119,7 +144,12 @@
 	}
 
 	/**
-	 * @param array $instance
+	 * Outputs the settings update form.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 *
+	 * @param array $instance Current settings.
 	 */
 	public function form( $instance ) {
 		$title = isset( $instance['title'] ) ? $instance['title'] : '';