diff --git a/modules/widgets/google-translate.php b/modules/widgets/google-translate.php
index 6ed462867728f..c6f75e3738ae8 100644
--- a/modules/widgets/google-translate.php
+++ b/modules/widgets/google-translate.php
@@ -1,34 +1,46 @@
 <?php
-/*
-Plugin Name: Google Translate Widget for WordPress.com
-Plugin URI: http://automattic.com
-Description: Add a widget for automatic translation
-Author: Artur Piszek
-Version: 0.1
-Author URI: http://automattic.com
-Text Domain: jetpack
-*/
-
+/**
+ * Plugin Name: Google Translate Widget for WordPress.com
+ * Plugin URI: http://automattic.com
+ * Description: Add a widget for automatic translation
+ * Author: Artur Piszek
+ * Version: 0.1
+ * Author URI: http://automattic.com
+ * Text Domain: jetpack
+ */
 class Google_Translate_Widget extends WP_Widget {
 	static $instance = null;
 
+	/**
+	 * Register widget with WordPress.
+	 */
 	function __construct() {
 		parent::__construct(
 			'google_translate_widget',
+			/** This filter is documented in modules/widgets/facebook-likebox.php */
 			apply_filters( 'jetpack_widget_name', __( 'Google Translate', 'jetpack' ) ),
-			array( 'description' => __( 'Automatic translation of your site content', 'jetpack' ), ) 
+			array( 'description' => __( 'Automatic translation of your site content', 'jetpack' ) )
 		);
 		wp_register_script( 'google-translate-init', plugins_url( 'google-translate/google-translate.js', __FILE__ ) );
 		wp_register_script( 'google-translate', '//translate.google.com/translate_a/element.js?cb=googleTranslateElementInit', [ 'google-translate-init' ] );
 	}
 
+	/**
+	 * Display the Widget.
+	 *
+	 * @see WP_Widget::widget()
+	 *
+	 * @param array $args     Display arguments.
+	 * @param array $instance The settings for the particular instance of the widget.
+	 */
 	public function widget( $args, $instance ) {
-		// We never should show more than 1 instance of this
-		if ( self::$instance === null ) {
+		// We never should show more than 1 instance of this.
+		if ( null === self::$instance ) {
+			/** This filter is documented in core/src/wp-includes/default-widgets.php */
 			$title = apply_filters( 'widget_title', $instance['title'] );
 			echo $args['before_widget'];
 			if ( ! empty( $title ) ) {
-				echo $args['before_title'] . $title . $args['after_title'];			
+				echo $args['before_title'] . esc_html( $title ) . $args['after_title'];
 			}
 			wp_localize_script( 'google-translate-init', '_wp_google_translate_widget', array( lang => get_locale() ) );
 			wp_enqueue_script( 'google-translate-init' );
@@ -43,31 +55,50 @@ public function widget( $args, $instance ) {
 			}
 		}
 	}
-			
+
+	/**
+	 * Widget form in the dashboard.
+	 *
+	 * @see WP_Widget::form()
+	 *
+	 * @param array $instance Previously saved values from database.
+	 */
 	public function form( $instance ) {
-		if ( isset( $instance[ 'title' ] ) ) {
-			$title = $instance[ 'title' ];
+		if ( isset( $instance['title'] ) ) {
+			$title = $instance['title'];
 		} else {
 			$title = '';
 		}
 		?>
 <p>
-	<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php esc_html_e( 'Title:', 'jetpack' ); ?></label> 
+	<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php esc_html_e( 'Title:', 'jetpack' ); ?></label>
 	<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
 </p>
-		<?php 
+		<?php
 	}
-		
-	// Updating widget replacing old instances with new
+
+	/**
+	 * Sanitize widget form values as they are saved.
+	 *
+	 * @see WP_Widget::update()
+	 *
+	 * @param array $new_instance Values just sent to be saved.
+	 * @param array $old_instance Previously saved values from database.
+	 *
+	 * @return array $instance Updated safe values to be saved.
+	 */
 	public function update( $new_instance, $old_instance ) {
 		$instance = array();
 		$instance['title'] = ( ! empty( $new_instance['title'] ) ) ? strip_tags( $new_instance['title'] ) : '';
 		return $instance;
 	}
+
 }
 
-function load_Google_Translate_Widget() {
+/**
+ * Register the widget for use in Appearance -> Widgets.
+ */
+function jetpack_google_translate_widget_init() {
 	register_widget( 'Google_Translate_Widget' );
 }
-add_action( 'widgets_init', 'load_Google_translate_widget' );
-
+add_action( 'widgets_init', 'jetpack_google_translate_widget_init' );