How to set Content-type properly

Hi.

I am using :
Apache/2.2.9 (Debian) DAV/2 SVN/1.5.1 mod_jk/1.2.26 PHP/5.2.6-1+lenny9 with Suhosin-Patch 
mod_ssl/2.2.9 OpenSSL/0.9.8g mod_apreq2-20051231/2.6.0 mod_perl/2.0.4 Perl/v5.10.0

In a PerlResponseHandler, I am using Template-Toolkit to generate html pages sent back to 
the browser.
Before rendering a template, I set the response Content-type header, as :

$r->content_type('text/html');

This results in a HTTP response to the browser, with the following header :

Content-Type:	text/html

However, I would like this :

Content-Type:	text/html; charset=UTF-8

How do I do that ?

is

$r->content_type('text/html; charset=UTF-8');

admissible ?