diff --git a/src/wp-includes/class-wp-block-type-registry.php b/src/wp-includes/class-wp-block-type-registry.php
index 0cc3e94c18..2cddfb07e8 100644
--- a/src/wp-includes/class-wp-block-type-registry.php
+++ b/src/wp-includes/class-wp-block-type-registry.php
@@ -43,6 +43,7 @@ final class WP_Block_Type_Registry {
 	 *
 	 *     @type callable $render_callback Callback used to render blocks of this block type.
 	 *     @type array    $attributes      Block attributes mapping, property name to schema.
+	 *                                     Accepts any public property of `WP_Block_Type`.
 	 * }
 	 * @return WP_Block_Type|false The registered block type on success, or false on failure.
 	 */
diff --git a/src/wp-includes/cron.php b/src/wp-includes/cron.php
index e6957c35c3..7337ba307e 100644
--- a/src/wp-includes/cron.php
+++ b/src/wp-includes/cron.php
@@ -130,8 +130,8 @@ function wp_schedule_single_event( $timestamp, $hook, $args = array() ) {
 	 *
 	 * @since 3.1.0
 	 *
-	 * @param stdClass $event {
-	 *     An object containing an event's data.
+	 * @param stdClass|false $event {
+	 *     An object containing an event's data, or boolean false to prevent the event from being scheduled.
 	 *
 	 *     @type string       $hook      Action hook to execute when the event is run.
 	 *     @type int          $timestamp Unix timestamp (UTC) for when to next run the event.
diff --git a/src/wp-includes/ms-functions.php b/src/wp-includes/ms-functions.php
index 688b758263..dae8d4f742 100644
--- a/src/wp-includes/ms-functions.php
+++ b/src/wp-includes/ms-functions.php
@@ -176,8 +176,8 @@ function add_user_to_blog( $blog_id, $user_id, $role ) {
 	 *
 	 * @since 4.9.0
 	 *
-	 * @param bool|WP_Error $retval  True if the user should be added to the site, false
-	 *                               or error object otherwise.
+	 * @param true|WP_Error $retval  True if the user should be added to the site, error
+	 *                               object otherwise.
 	 * @param int           $user_id User ID.
 	 * @param string        $role    User role.
 	 * @param int           $blog_id Site ID.