diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
index 723c5f477b..6572ad27c9 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php
@@ -185,6 +185,7 @@ class WP_REST_Search_Controller extends WP_REST_Controller {
 	 * Prepares a single search result for response.
 	 *
 	 * @since 5.0.0
+	 * @since 5.6.0 The `$id` parameter can accept a string.
 	 *
 	 * @param int|string      $id      ID of the item to prepare.
 	 * @param WP_REST_Request $request Request object.
diff --git a/wp-includes/rest-api/search/class-wp-rest-search-handler.php b/wp-includes/rest-api/search/class-wp-rest-search-handler.php
index be2cc21b13..b2aa64e916 100644
--- a/wp-includes/rest-api/search/class-wp-rest-search-handler.php
+++ b/wp-includes/rest-api/search/class-wp-rest-search-handler.php
@@ -78,6 +78,7 @@ abstract class WP_REST_Search_Handler {
 	 * Prepares the search result for a given ID.
 	 *
 	 * @since 5.0.0
+	 * @since 5.6.0 The `$id` parameter can accept a string.
 	 *
 	 * @param int|string $id     Item ID.
 	 * @param array      $fields Fields to include for the item.
@@ -89,6 +90,7 @@ abstract class WP_REST_Search_Handler {
 	 * Prepares links for the search result of a given ID.
 	 *
 	 * @since 5.0.0
+	 * @since 5.6.0 The `$id` parameter can accept a string.
 	 *
 	 * @param int|string $id Item ID.
 	 * @return array Links for the given item.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3b02eedcee..f236d18b95 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49088';
+$wp_version = '5.6-alpha-49089';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.