docs: function (pngFile, outputFile) {
          var pngout = require('pngout-bin').path,
              command = format('%s "%s" "%s" -s%s -k0 -v -r -force -nil',
                  pngout,
                  pngFile.name,
                  outputFile.name,
                  pngFile.isLarge() ? 1 : 0
              );
  
          return _compress(command, outputFile);
      }