Index: src/wp-admin/menu.php
===================================================================
--- src/wp-admin/menu.php	(revision 51607)
+++ src/wp-admin/menu.php	(working copy)
@@ -316,6 +316,10 @@
 
 $menu[99] = array( '', 'read', 'separator-last', '', 'wp-menu-separator' );
 
+if ( is_multisite() ) {
+	$menu[100] = array( __( 'Network Admin' ), 'manage_network', 'network/index.php', '', 'menu-top menu-icon-admin-multisite', 'menu-admin-multisite', 'dashicons-admin-multisite' );
+}
+
 // Back-compat for old top-levels.
 $_wp_real_parent_file['post.php']       = 'edit.php';
 $_wp_real_parent_file['post-new.php']   = 'edit.php';