Typo (?) in HTML 4.01, 7.4.4.2

In HTML 4.01, 7.4.4.2, "META and search engine" section:

    <-- For speakers of British English -->
    <META name="keywords" lang="en" 
             content="holiday, Greece, sunshine">

Isn't it good to change the lang attribute value to "en-gb" ?

--
UCHIDA Akira <uchida@happy.email.ne.jp>
Public key : <http://www.asahi-net.or.jp/%7Esd5a-ucd/PGP.html>