diff --git a/lib/packer-sync.js b/lib/packer-sync.js
index 5673dbc..b7672bf 100644
--- a/lib/packer-sync.js
+++ b/lib/packer-sync.js
@@ -4,8 +4,8 @@ var zlib = require('zlib');
 var constants = require('./constants');
 var Packer = require('./packer');
 
-module.exports = function(metaData, options) {
-  options = options || {};
+module.exports = function(metaData, opt) {
+  var options = opt || {};
   options.deflateChunkSize = options.deflateChunkSize || 32 * 1024;
   options.deflateLevel = options.deflateLevel != null ? options.deflateLevel : 9;
   options.deflateStrategy = options.deflateStrategy != null ? options.deflateStrategy : 3;
diff --git a/lib/packer.js b/lib/packer.js
index 95334e3..c8a27f2 100644
--- a/lib/packer.js
+++ b/lib/packer.js
@@ -1,6 +1,4 @@
-/**
- * Created by gusc on 15.3.12.
- */
+'use strict';
 
 var constants = require('./constants');
 var CrcStream = require('./crc');