public function getEnd()
    {
        $reachedContent = false;

        foreach ($this->doc->getLines() as $index => $line) {
            // we went past a description, then hit a tag or blank line, so
            // the last line of the description must be the one before this one
            if ($reachedContent && ($line->containsATag() || !$line->containsUsefulContent())) {
                return $index - 1;
            }

            // no short description was found
            if ($line->containsATag()) {
                return null;
            }

            // we've reached content, but need to check the next lines too
            // in case the short description is multi-line
            if ($line->containsUsefulContent()) {
                $reachedContent = true;
            }
        }
    }