diff --git a/wp-includes/cron.php b/wp-includes/cron.php
index e47c70b4bc..f65d78e994 100644
--- a/wp-includes/cron.php
+++ b/wp-includes/cron.php
@@ -298,6 +298,7 @@ function spawn_cron( $gmt_time = 0 ) {
 	 * Filter the cron request arguments.
 	 *
 	 * @since 3.5.0
+	 * @since 4.5.0 $doing_wp_cron was added to the filter arguments.
 	 *
 	 * @param array $cron_request_array {
 	 *     An array of cron request URL arguments.
@@ -312,6 +313,7 @@ function spawn_cron( $gmt_time = 0 ) {
 	 *         @type bool $sslverify Whether SSL should be verified for the request. Default false.
 	 *     }
 	 * }
+	 * @param string $doing_wp_cron The unix timestamp of the cron lock.
 	 */
 	$cron_request = apply_filters( 'cron_request', array(
 		'url'  => add_query_arg( 'doing_wp_cron', $doing_wp_cron, site_url( 'wp-cron.php' ) ),
@@ -322,7 +324,7 @@ function spawn_cron( $gmt_time = 0 ) {
 			/** This filter is documented in wp-includes/class-wp-http-streams.php */
 			'sslverify' => apply_filters( 'https_local_ssl_verify', false )
 		)
-	) );
+	), $doing_wp_cron );
 
 	wp_remote_post( $cron_request['url'], $cron_request['args'] );
 }
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 50f6a3908c..f5c21453ae 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36227';
+$wp_version = '4.5-alpha-36228';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.