Nothing urgent but might be cleaner to edit the description in "sitemap.php" from:
Description: This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.
to:
Description: This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo and Bing to better index your blog.
Since Ask.com was no longer available to notify and was dropped.
Regards damsko.
http://wordpress.org/extend/plugins/google-sitemap-generator/
