Performance hack question

Hi all,

In the performance hack section i saw this :

`
SECOND: If your web server is supporting gzip compression, edit index.php and add following line at Top of the page.
header("Vary: Accept-Encoding");if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], ‘gzip’))
ob_start(”ob_gzhandler”);
else ob_start();
`
But wicth index.php is it. The root index.php file or the index.php file in theme directory.
I put in the root at this time, but i don't really see something different.

Regards

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