diff --git a/lib/w3cjs.js b/lib/w3cjs.js
index 936031b..750a518 100644
--- a/lib/w3cjs.js
+++ b/lib/w3cjs.js
@@ -7,6 +7,7 @@ var w3cCheckUrl = 'http://validator.w3.org/nu/';
 var defaultOutput = 'json';
 var defaultDoctype = null;
 var defaultCharset = null;
+var defaultParser = 'html';
 var defaultProxy = null;
 
 var defaultCallback = function (res) {
@@ -22,6 +23,7 @@ function validate(options) {
 	var callback = options.callback || defaultCallback;
 	var doctype = options.doctype || defaultDoctype;
 	var charset = options.charset || defaultCharset;
+	var parser = options.parser || defaultParser;
 	var file = options.file;
 	var input = options.input;
 	var context = '';
@@ -42,6 +44,9 @@ function validate(options) {
 
 	var req = getRequest(type !== 'remote', options);
 
+	if (parser)
+		req.query({ parser: parser });
+
 	if(type === 'remote') {
 		req.query({ out: output });
 		req.query({ doc: file });