diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index b6801302..4db41ef2 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -2,13 +2,19 @@ var bcoin = require('../../bcoin');
 var constants = require('./constants');
 var utils = bcoin.utils;
 var assert = utils.assert;
+var version = require('../../../package.json').version;
 
 var writeU32 = utils.writeU32;
 var writeAscii = utils.writeAscii;
 
-function Framer() {
+function Framer(options) {
   if (!(this instanceof Framer))
-    return new Framer();
+    return new Framer(options);
+
+  options = options || {};
+
+  this.options = options;
+  this.agent = utils.toArray(options.agent || '/bcoin:' + version + '/');
 }
 module.exports = Framer;
 
@@ -49,42 +55,52 @@ Framer.prototype._addr = function addr(buf, off) {
   writeU32(buf, 0, off + 20);
   buf[off + 24] = 0;
   buf[off + 25] = 0;
+  return 26;
 };
 
 Framer.prototype.version = function version(packet) {
   var p = new Array(86);
+  var off = 0;
 
   if (!packet)
     packet = {};
 
   // Version
-  writeU32(p, constants.version, 0);
+  off += writeU32(p, constants.version, off);
 
   // Services
-  writeU32(p, constants.services.network, 4);
-  writeU32(p, 0, 8);
+  off += writeU32(p, constants.services.network, off);
+  off += writeU32(p, 0, off);
 
   // Timestamp
   var ts = ((+new Date()) / 1000) | 0;
-  writeU32(p, ts, 12);
-  writeU32(p, 0, 16);
+  off += writeU32(p, ts, off);
+  off += writeU32(p, 0, off);
 
   // Remote and local addresses
-  this._addr(p, 20);
-  this._addr(p, 46);
+  off += this._addr(p, off);
+  off += this._addr(p, off);
 
   // Nonce, very dramatic
-  writeU32(p, (Math.random() * 0xffffffff) | 0, 72);
-  writeU32(p, (Math.random() * 0xffffffff) | 0, 76);
+  off += writeU32(p, (Math.random() * 0xffffffff) | 0, off);
+  off += writeU32(p, (Math.random() * 0xffffffff) | 0, off);
 
-  // No user-agent
-  p[80] = 0;
+  // User-agent
+  assert.equal(off, 80);
+  if (!this.agent) {
+    p[off++] = 0;
+  } else {
+    off += varint(p, this.agent.length, off);
+    for (var i = 0; i < this.agent.length; i++) {
+      p[off++] = this.agent[i];
+    }
+  }
 
   // Start height
-  writeU32(p, packet.height, 81);
+  off += writeU32(p, packet.height, off);
 
   // Relay
-  p[85] = packet.relay ? 1 : 0;
+  p[off++] = packet.relay ? 1 : 0;
 
   return this.packet('version', p);
 };