add function comments and fixed demo options.

.npmignore

@@ -0,0 +1,2 @@
+test/
+Makefile

README.md

@@ -10,7 +10,8 @@ var onehost = require('onehost');
 
 var app = connect(
   onehost({
-    toHost: 'localhost.cnodejs.org'
+    host: 'localhost.cnodejs.org',
+    // exclude: 'dev.cnodejs.org',
   }),
   function (req, res) {
     res.end(JSON.stringify({headers: req.headers, url: req.url}));

example/demo.js

@@ -3,7 +3,7 @@ var onehost = require('../');
 
 var app = connect(
   onehost({
-    toHost: 'localhost'
+    host: 'localhost'
   }),
   function (req, res) {
     res.end(JSON.stringify({headers: req.headers, url: req.url}));

lib/onehost.js

@@ -11,6 +11,16 @@
  * Module dependencies.
  */
 
+/**
+ * One host binding middleware.
+ * 
+ * @param {Object} options
+ *  - {String} host, which host should be binding.
+ *  - {Array|String} [exclude], ignore hosts, they won't be handle.
+ *    e.g.: 'abc.com' or `['abc.com', 'dec.com']`, default is `[]`.
+ *  - {String} [protocol], http or https, default is http.
+ * @return {Function(req, res, next)} middleware function.
+ */
 module.exports = function onehost(options) {
   var EXCLUDE_HOST_RE = null;
   options = options || {};