diff --git a/wp-includes/class-wp-editor.php b/wp-includes/class-wp-editor.php
index a9cbe3f88b..7caf54871a 100644
--- a/wp-includes/class-wp-editor.php
+++ b/wp-includes/class-wp-editor.php
@@ -1265,6 +1265,7 @@ final class _WP_Editors {
 			'Link options'  => __( 'Link options' ), // Tooltip for the 'link options' button in the inline link dialog
 			'Visual' => _x( 'Visual', 'Name for the Visual editor tab' ), // Editor switch tab label
 			'Text' => _x( 'Text', 'Name for the Text editor tab (formerly HTML)' ), // Editor switch tab label
+			'Add Media' => array( __( 'Add Media' ), 'accessM' ), // Tooltip for the 'Add Media' button in the Block Editor Classic block
 
 			// Shortcuts help modal
 			'Keyboard Shortcuts' => array( __( 'Keyboard Shortcuts' ), 'accessH' ),
diff --git a/wp-includes/version.php b/wp-includes/version.php
index fc06d87b85..1c8fa73311 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0.3-alpha-44393';
+$wp_version = '5.0.3-alpha-44400';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.