diff --git a/wp-includes/post.php b/wp-includes/post.php
index d035acb045..2a02400bd1 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -6802,9 +6802,10 @@ function wp_attachment_is_image( $post = null ) {
  * Retrieves the icon for a MIME type or attachment.
  *
  * @since 2.1.0
+ * @since 6.5.0 Added the `$preferred_ext` parameter.
  *
  * @param string|int $mime          MIME type or attachment ID.
- * @param string     $preferred_ext File format to prefer in return. Default .png.
+ * @param string     $preferred_ext File format to prefer in return. Default '.png'.
  * @return string|false Icon, false otherwise.
  */
 function wp_mime_type_icon( $mime = 0, $preferred_ext = '.png' ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 2ff3b40427..9150c47cee 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-beta2-57700';
+$wp_version = '6.5-beta2-57701';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.