diff --git a/wp-includes/customize/class-wp-customize-upload-control.php b/wp-includes/customize/class-wp-customize-upload-control.php
index 5442dab42c..c992146784 100644
--- a/wp-includes/customize/class-wp-customize-upload-control.php
+++ b/wp-includes/customize/class-wp-customize-upload-control.php
@@ -15,10 +15,31 @@
  * @see WP_Customize_Media_Control
  */
 class WP_Customize_Upload_Control extends WP_Customize_Media_Control {
-	public $type          = 'upload';
-	public $mime_type     = '';
+	/**
+	 * Control type.
+	 *
+	 * @since 3.4.0
+	 * @var string
+	 */
+	public $type = 'upload';
+
+	/**
+	 * Media control mime type.
+	 *
+	 * @since 4.1.0
+	 * @var string
+	 */
+	public $mime_type = '';
+
+	/**
+	 * Button labels.
+	 *
+	 * @since 4.1.0
+	 * @var array
+	 */
 	public $button_labels = array();
-	public $removed       = '';   // Unused.
+
+	public $removed = '';         // Unused.
 	public $context;              // Unused.
 	public $extensions = array(); // Unused.
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8a2a2bb489..2e9b5b49d1 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49678';
+$wp_version = '5.7-alpha-49679';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.