When i `dpm` that `$vars`, in `classes` key, there is no `r_style` class, whyyyy? I tried clear cache through `devel` module, but still the same, what i am doing wrong?

    name = JH Template
    core = 7.x
    engine = phptemplate
    
    styles[all][] = css/style.css
    settings[bg_style] = 'r_style'


**theme-settings.php**

    function jh_process_html(&$vars) {
        $vars['classes'] .= ' ' . theme_get_setting('bg_style');
        dpm($vars); // in classes string isn't r_style class
    }