No "Quick Tips" on the homepage

gistfile1.txt

// No "Quick Tips" on the homepage
// http://www.wprecipes.com/how-to-prevent-posts-from-a-particular-category-to-be-displayed-in-wordpress-loop
function preventHomepageTips($query) {
  if($query->is_home() && $query->is_main_query()) {
    $query->set('cat', '-40'); // 40 is Quick Tips's category ID
  }
}
add_action('pre_get_posts', 'preventHomepageTips');