Index: wp-admin/network/index.php
===================================================================
--- wp-admin/network/index.php	(revision 21299)
+++ wp-admin/network/index.php	(working copy)
@@ -29,7 +29,8 @@
 			'<p>' . __('Until WordPress 3.0, running multiple sites required using WordPress MU instead of regular WordPress. In version 3.0, these applications have merged. If you are a former MU user, you should be aware of the following changes:') . '</p>' .
 			'<ul><li>' . __('Site Admin is now Super Admin (we highly encourage you to get yourself a cape!).') . '</li>' .
 			'<li>' . __('Blogs are now called Sites; Site is now called Network.') . '</li></ul>' .
-			'<p>' . __('The Right Now box provides the network administrator with links to the screens to either create a new site or user, or to search existing users and sites. Screens for Sites and Users are also accessible through the left-hand navigation in the Network Admin section.') . '</p>'
+			'<p>' . __('The Right Now box provides the network administrator with links to the screens to either create a new site or user, or to search existing users and sites. Screens for Sites and Users are also accessible through the left-hand navigation in the Network Admin section.') . '</p>' .
+			'<p>' . __('The counts for network sites and users in the Right Now box are updated twice a day. Current counts can be found in the Sites and Users screens.') . '</p>'
 ) );
 
 get_current_screen()->set_help_sidebar(