Форумы / Cotonti / Core Labs / Seo Upgrading Title Sequence

I wanted my titles to be:
subject of the page -> name of the site
instead of

name of the site -> subject of the page

So I opened system/header.php and changed the following line (around line #95):

"HEADER_TITLE" => $plug_title.$out['fulltitle'],[code]

into this one:


[code]"HEADER_TITLE" => $plug_title.$out['subtitle'].' - ' .$cfg['maintitle'],

Being an absolute beginner in core coding, my question is: will I ruin anything?