Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 12605)
+++ wp-admin/update-core.php	(working copy)
@@ -42,7 +42,7 @@
 			elseif ( !$mysql_compat )
 				$message = sprintf( __('You cannot upgrade because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.'), $update->current, $update->mysql_version, $mysql_version );
 			else
-				$message = 	sprintf(__('You can upgrade to version %s automatically or download the package and install it manually:'), $version_string);
+				$message = 	sprintf(__('Review information about <a href="http://codex.wordpress.org/Version_%1$s">version %1$s</a>.</p><p>You can upgrade to version %2$s automatically or download the package and install it manually:'), $update->current, $version_string);
 			if ( !$mysql_compat || !$php_compat )
 				$show_buttons = false;
 		}