Images Expires Tags : SEO problem

I made a seo site checkup an i got this message. "Your site is not using expires headers for your images. An expires tag can help speed up the serving of your webpages for users that regularly visit your site and see the same images. Learn more about how to add expires headers to your images."

Adding this code to .htaccess will make the server load faster :D

Code:

---

<FilesMatch "\.(ico|jpg|jpeg|png|gif|js|css)$">
Header set Expires "Thu, 15 Apr 2010 20:00:00 GMT"
</FilesMatch>

---

Applied and appreciated :)
Thanks