diff --git a/docs/zh_CN/index.md b/docs/zh_CN/index.md
index 5988698fe..371fc55bf 100644
--- a/docs/zh_CN/index.md
+++ b/docs/zh_CN/index.md
@@ -13,7 +13,7 @@ SuperAgent是轻量级的渐进式ajax API，具有灵活性、可读性和较
 
 ## 测试文档 
 
-[**English**](/)
+[**English**](/superagent/)
 
 下面的[测试文档](../test.html)是用[Mocha](https://mochajs.org/)的"文档"报告器生成的，并直接反映了测试套件。 这提供了额外的文档来源。  
 
diff --git a/src/request-base.js b/src/request-base.js
index dc564a2d6..0922636f7 100644
--- a/src/request-base.js
+++ b/src/request-base.js
@@ -17,7 +17,7 @@ module.exports = RequestBase;
  * @api public
  */
 
-function RequestBase() {}
+function RequestBase() { }
 
 /**
  * Clear previous timeout.
@@ -460,7 +460,10 @@ RequestBase.prototype.field = function (name, value, options) {
     value = String(value);
   }
 
-  this._getFormData().append(name, value, options);
+  //fix https://github.com/visionmedia/superagent/issues/1680
+  if (options) this._getFormData().append(name, value, options);
+  else this._getFormData().append(name, value);
+
   return this;
 };