public function addFilenameSuffix($suffix)
    {
        $path                 = $this->fi->getPath();
        $ext                  = $this->fi->getExtension();
        $nameWithoutExtension = preg_replace('/\.' . $ext . '$/', '', $this->fi->getFilename());
        $this->fi             = new \SplFileInfo(sprintf('%s/%s%s.%s', $path, $nameWithoutExtension, $suffix, $ext));
        return $this;
    }