Index: wp-includes/ms-functions.php
===================================================================
--- wp-includes/ms-functions.php	(revision 18483)
+++ wp-includes/ms-functions.php	(working copy)
@@ -1826,7 +1826,7 @@
 	if ( empty( $details ) || is_wp_error( add_existing_user_to_blog( $details ) ) )
 		wp_die( sprintf(__('An error occurred adding you to this site. Back to the <a href="%s">homepage</a>.'), site_url() ) );
 
-	wp_die( sprintf(__('You have been added to this site. Please visit the <a href="%s">homepage</a> or <a href="%s">login</a> using your username and password.'), site_url(), admin_url() ), __('Success') );
+	wp_die( sprintf(__('You have been added to this site. Please visit the <a href="%s">homepage</a> or <a href="%s">log in</a> using your username and password.'), site_url(), admin_url() ), __('Success') );
 }
 
 /**