diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
index 046c0a8369..1c54865e66 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
@@ -21,6 +21,8 @@ class WP_REST_Pattern_Directory_Controller extends WP_REST_Controller {
 
 	/**
 	 * Constructs the controller.
+	 *
+	 * @since 5.8.0
 	 */
 	public function __construct() {
 		$this->namespace     = 'wp/v2';
@@ -29,6 +31,8 @@ class WP_REST_Pattern_Directory_Controller extends WP_REST_Controller {
 
 	/**
 	 * Registers the necessary REST API routes.
+	 *
+	 * @since 5.8.0
 	 */
 	public function register_routes() {
 		register_rest_route(
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
index 3ab7dc993b..e6ccd1f0a5 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-sidebars-controller.php
@@ -365,6 +365,8 @@ class WP_REST_Sidebars_Controller extends WP_REST_Controller {
 	/**
 	 * Retrieves the block type' schema, conforming to JSON Schema.
 	 *
+	 * @since 5.8.0
+	 *
 	 * @return array Item schema data.
 	 */
 	public function get_item_schema() {
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
index 7853c73920..33fbcfa385 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-widget-types-controller.php
@@ -413,6 +413,8 @@ class WP_REST_Widget_Types_Controller extends WP_REST_Controller {
 	 * - form:     The widget's admin form after updating the widget with the
 	 *             given form data.
 	 *
+	 * @since 5.8.0
+	 *
 	 * @global WP_Widget_Factory $wp_widget_factory
 	 *
 	 * @param WP_REST_Request $request Full details about the request.
@@ -507,6 +509,8 @@ class WP_REST_Widget_Types_Controller extends WP_REST_Controller {
 	 * Returns the output of WP_Widget::widget() when called with the provided
 	 * instance. Used by encode_form_data() to preview a widget.
 
+	 * @since 5.8.0
+	 *
 	 * @param string    $widget   The widget's PHP class name (see class-wp-widget.php).
 	 * @param array     $instance Widget instance settings.
 	 * @return string
@@ -521,6 +525,8 @@ class WP_REST_Widget_Types_Controller extends WP_REST_Controller {
 	 * Returns the output of WP_Widget::form() when called with the provided
 	 * instance. Used by encode_form_data() to preview a widget's form.
 	 *
+	 * @since 5.8.0
+	 *
 	 * @param WP_Widget $widget_object Widget object to call widget() on.
 	 * @param array     $instance Widget instance settings.
 	 * @return string
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8c850a61c3..8954496983 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51279';
+$wp_version = '5.9-alpha-51280';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.