diff --git a/docs/web3-eth.rst b/docs/web3-eth.rst
index d634b2f5c3d..9e7cec8035e 100644
--- a/docs/web3-eth.rst
+++ b/docs/web3-eth.rst
@@ -1096,8 +1096,8 @@ Example
 
 .. code-block:: javascript
 
-    var Tx = require('ethereumjs-tx');
-    var privateKey = new Buffer('e331b6d69882b4cb4ea581d88e0b604039a3de5967688d3dcffdd2270c0fd109', 'hex')
+    var Tx = require('ethereumjs-tx').Transaction;
+    var privateKey = new Buffer.from('e331b6d69882b4cb4ea581d88e0b604039a3de5967688d3dcffdd2270c0fd109', 'hex')
 
     var rawTx = {
       nonce: '0x00',
@@ -1108,7 +1108,7 @@ Example
       data: '0x7f7465737432000000000000000000000000000000000000000000000000000000600057'
     }
 
-    var tx = new Tx(rawTx);
+    var tx = new Tx(rawTx, {'chain':'ropsten'});
     tx.sign(privateKey);
 
     var serializedTx = tx.serialize();
@@ -1121,6 +1121,8 @@ Example
 
     > // see eth.getTransactionReceipt() for details
 
+.. note:: When use the package `ethereumjs-tx` at the version of `2.0.0`, if we don't specify the parameter `chain`, it will use `mainnet`, so if you wan to use at the other network, you should add this parameter `chain` to specify.
+
 
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