2.7 Upgrade question

I have just completed the upgrade to 2.7 which seems to have gone to plan, but I do have one simple (I hope) question.

In the upgrade instructions on this site, under the sub-heading "Wrap up" is this instruction:
"Step 2: Modify your templates
In the future, modules will provide a frontend.css and backend.css file to store the CSS definitions of the modules. To automatically add those files into the head section of your template, please add the following code to the index.php of your template.

<?php // allows to include optional module files (frontend.css, frontend.js) into the head
if(function_exists('register_frontend_m odfiles')) {
register_frontend_m odfiles('css');
register_frontend_m odfiles('js');
} ?>
"
My question is: where in the index.php file should this be inserted? I am using the Andreas09 template and don't understand where I shouuld add this code. Any help would be appreciated.

Thanks,

David.