diff --git a/lib/node-http-proxy.js b/lib/node-http-proxy.js
index b36b0a5..5b30368 100644
--- a/lib/node-http-proxy.js
+++ b/lib/node-http-proxy.js
@@ -32,6 +32,11 @@ var util = require('util'),
     ProxyTable = require('./proxy-table').ProxyTable,
     maxSockets = 100;
 
+//
+// ### Version 0.4.0
+//
+exports.version = [0, 4, 0];
+
 //
 // ### function _getAgent (host, port)
 // #### @host {string} Host of the agent to get