Index: src/wp-includes/widgets/class-wp-widget-rss.php
===================================================================
--- src/wp-includes/widgets/class-wp-widget-rss.php	(revision 34549)
+++ src/wp-includes/widgets/class-wp-widget-rss.php	(working copy)
@@ -16,6 +16,12 @@
  */
 class WP_Widget_RSS extends WP_Widget {
 
+	/**
+	 * Creates a new RSS widget instance.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 */
 	public function __construct() {
 		$widget_ops = array( 'description' => __('Entries from any RSS or Atom feed.') );
 		$control_ops = array( 'width' => 400, 'height' => 200 );
@@ -23,8 +29,14 @@
 	}
 
 	/**
-	 * @param array $args
-	 * @param array $instance
+	 * Echoes the current RSS widget instance 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, $instance ) {
 		if ( isset($instance['error']) && $instance['error'] )
@@ -79,9 +91,19 @@
 	}
 
 	/**
-	 * @param array $new_instance
-	 * @param array $old_instance
-	 * @return array
+	 * Handles updating settings for the current RSS widget instance.
+	 *
+	 * This function should check that `$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 ) {
 		$testurl = ( isset( $new_instance['url'] ) && ( !isset( $old_instance['url'] ) || ( $new_instance['url'] != $old_instance['url'] ) ) );
@@ -89,7 +111,12 @@
 	}
 
 	/**
-	 * @param array $instance
+	 * Outputs the current RSS widget instance settings update form.
+	 *
+	 * @since 2.8.0
+	 * @access public
+	 *
+	 * @param array $instance Current settings.
 	 */
 	public function form( $instance ) {
 		if ( empty( $instance ) ) {