diff --git a/Readme.md b/Readme.md
index b003b33..c04ea75 100644
--- a/Readme.md
+++ b/Readme.md
@@ -10,7 +10,7 @@ Also provides rudimentary OAuth2 support, tested against facebook connect and gi
 Change History
 ============== 
 
-* 0.10.0 - OAuth2: Pass back any extra response data for calls to getOAuthAccessToken (Thanks to Tang Bo Hao)  OAuth2: Don't force a https request if given a http url (Thanks to Damien Mathieu)
+* 0.10.0 - OAuth2: Pass back any extra response data for calls to getOAuthAccessToken (Thanks to Tang Bo Hao)  OAuth2: Don't force a https request if given a http url (Thanks to Damien Mathieu) OAuth2: Supports specifying a grant_type of 'refresh_token' (Thanks to Luke Baker)
 * 0.9.6 - Support for 302 redirects on OAuth2 (Thanks Patrick Negri). Some code tidying. ( Thanks to Raoul Millais )  
 * 0.9.5 - Allow usage of HTTP verbs other than GET for retrieving the access and request tokens (OAuth1) (Thanks to Raoul Millais)  
 * 0.9.4 - Support for OAuth providers that drop connections (don't send response lengths? [Google]) And change OAuth2 getOAuthAccessToken to POST rather than GET ( Possible Breaking change!!! ... re-tested against Google, Github, Facebook, FourSquare and Janrain and seems ok .. is closer to the spec (v20) )  
@@ -42,3 +42,4 @@ Contributors
 * Patrick Negri - http://github.com/pnegri
 * Tang Bo Hao - http://github.com/btspoony
 * Damien Mathieu - http://42.dmathieu.com
+* Luke Baker - http://github.com/lukebaker
diff --git a/lib/oauth2.js b/lib/oauth2.js
index 4cfe290..191d3ef 100644
--- a/lib/oauth2.js
+++ b/lib/oauth2.js
@@ -118,7 +118,8 @@ exports.OAuth2.prototype.getOAuthAccessToken= function(code, params, callback) {
   params['client_id'] = this._clientId;
   params['client_secret'] = this._clientSecret;
   params['type']= 'web_server';
-  params['code']= code;
+  var codeParam = (params.grant_type === 'refresh_token') ? 'refresh_token' : 'code';
+  params[codeParam]= code;
 
   var post_data= querystring.stringify( params );
   var post_headers= {
diff --git a/tests/oauth2.js b/tests/oauth2.js
index 1799d11..4eb47cd 100644
--- a/tests/oauth2.js
+++ b/tests/oauth2.js
@@ -3,8 +3,9 @@ var vows = require('vows'),
     OAuth2= require('../lib/oauth2').OAuth2;
 
 vows.describe('OAuth2').addBatch({
-    'When handling the access token response': {
-        topic: new OAuth2(),
+    'Given an OAuth2 instance, ': {
+      topic: new OAuth2(),
+      'When handling the access token response': {
         'we should correctly extract the token if received as form-data': function (oa) {
             oa._request= function( method, url, fo, bar, bleh, callback) {
               callback(null, "access_token=access&refresh_token=refresh");
@@ -35,5 +36,32 @@ vows.describe('OAuth2').addBatch({
             assert.equal( results.extra_2, "foo");
           });
         }
+      },
+      'When no grant_type parameter is specified': {
+        'we should pass the value of the code argument as the code parameter': function(oa) {
+          oa._request= function(method, url, headers, post_body, access_token, callback) {
+            assert.isTrue( post_body.indexOf("code=xsds23") != -1 )
+          }
+          oa.getOAuthAccessToken("xsds23", {} );
+        }
+      },
+      'When an invalid grant_type parameter is specified': {
+        'we should pass the value of the code argument as the code parameter': function(oa) {
+          oa._request= function(method, url, headers, post_body, access_token, callback) {
+            assert.isTrue( post_body.indexOf("code=xsds23") != -1 )
+          }
+          oa.getOAuthAccessToken("xsds23", {grant_type:"refresh_toucan"} );
+        }
+      },
+      'When a grant_type parameter of value "refresh_token" is specified': {
+        'we should pass the value of the code argument as the refresh_token parameter, should pass a grant_type parameter, but shouldn\'t pass a code parameter' : function(oa) {
+          oa._request= function(method, url, headers, post_body, access_token, callback) {
+            assert.isTrue( post_body.indexOf("refresh_token=sdsds2") != -1 )
+            assert.isTrue( post_body.indexOf("grant_type=refresh_token") != -1 )
+            assert.isTrue( post_body.indexOf("code=") == -1 )
+          }
+          oa.getOAuthAccessToken("sdsds2", {grant_type:"refresh_token"} );
+        }
+      }
     }
 }).export(module);
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