error in install.txt

I get an error if I use this example in install.txt:

line 55:     $output .= l("Pop up entire local page.", 'popups/test/response', array('attributes'=>array(array('class' => 'popups'))));

Seems like there is one array to many. This works:

    $output .= l("Pop up entire local page.", 'popups/test/response', array('attributes'=>array('class' => 'popups')));

Don't know if it was reported. Thanks for this module. I'm going to use it a lot :)