diff --git a/lib/core.js b/lib/core.js
index 9d45511..3fe2133 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -1,6 +1,6 @@
 'use strict';
 
-function log(debug) {
+function _log(debug) {
   if (debug) {
     var args = Array.prototype.slice.call(arguments);
     args.shift();
@@ -13,6 +13,7 @@ module.exports.create = function (le) {
   var PromiseA = require('bluebird');
   var utils = require('./utils');
   var RSA = PromiseA.promisifyAll(require('rsa-compat').RSA);
+  var log = le.log || _log; // allow custom log
 
   var core = {
     //