diff --git a/wp-includes/post.php b/wp-includes/post.php
index b34d8e9e63..f04900aed3 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -6114,7 +6114,7 @@ function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
  *
  * @since 2.1.0
  *
- * @param int  $attachment_id Attachment post ID. Default 0.
+ * @param int  $attachment_id Attachment post ID. Defaults to global $post.
  * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
  * @return array|false {
  *     Attachment metadata. False on failure.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3152682fc7..944a16fa07 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-50049';
+$wp_version = '5.7-alpha-50051';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.