diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 9a122366de..e79474c988 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -2844,6 +2844,8 @@ function remove_theme_support( $feature ) {
  * @global Custom_Background   $custom_background
  *
  * @param string $feature
+ *
+ * @return bool Returns true when support is removed, false when the feature was not registered.
  */
 function _remove_theme_support( $feature ) {
 	global $_wp_theme_features;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d78145e1f6..e27ca37322 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-48090';
+$wp_version = '5.5-alpha-48091';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.