diff --git a/lib/peer.js b/lib/peer.js
index fca80d0..4e20b44 100644
--- a/lib/peer.js
+++ b/lib/peer.js
@@ -19,6 +19,8 @@ var Peer = module.exports = function(options){
     var emptyNetAddress = new Buffer('010000000000000000000000000000000000ffff000000000000', 'hex');
     var userAgent = util.varStringBuffer('/node-stratum/');
     var blockStartHeight = new Buffer('00000000', 'hex'); //block start_height, can be empty
+    //If protocol version is new enough, add do not relay transactions flag byte, outlined in BIP37
+    //https://github.com/bitcoin/bips/blob/master/bip-0037.mediawiki#extensions-to-existing-messages
     var relayTransactions = options.protocolVersion >= 70001 ? new Buffer([false]) : new Buffer([]);
 
     //Command strings found at: https://en.bitcoin.it/wiki/Protocol_specification
@@ -160,4 +162,4 @@ var Peer = module.exports = function(options){
 
 };
 
-Peer.prototype.__proto__ = events.EventEmitter.prototype;
\ No newline at end of file
+Peer.prototype.__proto__ = events.EventEmitter.prototype;