How to comment a function using DocBlock

How can i specify that I’m setting the property $nAds

I was thinking to something like:

@set $nAds

but it didn’t worked

This is what I’m using

/**
 * Extract the number of ads of a province and set the property $nAds
 * 
 * @param string $html         The html of the first classified page
 */
private function extract_nPag($html){
    preg_match('/<strong>([0-9]+)</strong>/iU', $html, $result);
    $result[1] = str_replace(".", "", $result[1]);
    $this->nAds =  $result[1];
    }