diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index e5f4db63fe..71a50da662 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -722,6 +722,7 @@ $_new_bundled_files = array(
 	'themes/twentytwelve/'   => '3.5',
 	'themes/twentythirteen/' => '3.6',
 	'themes/twentyfourteen/' => '3.8',
+	'themes/twentyfifteen/'  => '4.1',
 );
 
 /**
diff --git a/src/wp-admin/includes/upgrade.php b/src/wp-admin/includes/upgrade.php
index dda925e94d..4cd481ed81 100644
--- a/src/wp-admin/includes/upgrade.php
+++ b/src/wp-admin/includes/upgrade.php
@@ -234,7 +234,7 @@ As a new WordPress user, you should go to <a href=\"%s\">your dashboard</a> to d
 	update_option( 'widget_archives', array ( 2 => array ( 'title' => '', 'count' => 0, 'dropdown' => 0 ), '_multiwidget' => 1 ) );
 	update_option( 'widget_categories', array ( 2 => array ( 'title' => '', 'count' => 0, 'hierarchical' => 0, 'dropdown' => 0 ), '_multiwidget' => 1 ) );
 	update_option( 'widget_meta', array ( 2 => array ( 'title' => '' ), '_multiwidget' => 1 ) );
-	update_option( 'sidebars_widgets', array ( 'wp_inactive_widgets' => array (), 'sidebar-1' => array ( 0 => 'search-2', 1 => 'recent-posts-2', 2 => 'recent-comments-2', 3 => 'archives-2', 4 => 'categories-2', 5 => 'meta-2', ), 'sidebar-2' => array (), 'sidebar-3' => array (), 'array_version' => 3 ) );
+	update_option( 'sidebars_widgets', array ( 'wp_inactive_widgets' => array (), 'sidebar-1' => array ( 0 => 'search-2', 1 => 'recent-posts-2', 2 => 'recent-comments-2', 3 => 'archives-2', 4 => 'categories-2', 5 => 'meta-2', ), 'array_version' => 3 ) );
 
 	if ( ! is_multisite() )
 		update_user_meta( $user_id, 'show_welcome_panel', 1 );
diff --git a/src/wp-admin/nav-menus.php b/src/wp-admin/nav-menus.php
index 66590be119..9ab2b1dcde 100644
--- a/src/wp-admin/nav-menus.php
+++ b/src/wp-admin/nav-menus.php
@@ -492,7 +492,7 @@ if ( ! current_theme_supports( 'menus' ) && ! $num_locations )
 
 if ( ! $locations_screen ) : // Main tab
 	$overview  = '<p>' . __( 'This screen is used for managing your custom navigation menus.' ) . '</p>';
-	$overview .= '<p>' . sprintf( __( 'Menus can be displayed in locations defined by your theme, even used in sidebars by adding a &#8220;Custom Menu&#8221; widget on the <a href="%1$s">Widgets</a> screen. If your theme does not support the custom menus feature (the default themes, %2$s and %3$s, do), you can learn about adding this support by following the Documentation link to the side.' ), admin_url( 'widgets.php' ), 'Twenty Fourteen', 'Twenty Thirteen' ) . '</p>';
+	$overview .= '<p>' . sprintf( __( 'Menus can be displayed in locations defined by your theme, even used in sidebars by adding a &#8220;Custom Menu&#8221; widget on the <a href="%1$s">Widgets</a> screen. If your theme does not support the custom menus feature (the default themes, %2$s and %3$s, do), you can learn about adding this support by following the Documentation link to the side.' ), admin_url( 'widgets.php' ), 'Twenty Fifteen', 'Twenty Fourteen' ) . '</p>';
 	$overview .= '<p>' . __( 'From this screen you can:' ) . '</p>';
 	$overview .= '<ul><li>' . __( 'Create, edit, and delete menus' ) . '</li>';
 	$overview .= '<li>' . __( 'Add, organize, and modify individual menu items' ) . '</li></ul>';