diff --git a/lib/index.js b/lib/index.js
index dccd34a..fd5b7ba 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,6 +7,7 @@ require('./algoProperties.js');
 var pool = require('./pool.js');
 
 exports.daemon = require('./daemon.js');
+exports.varDiff = require('./varDiff.js');
 
 
 exports.createPool = function(poolOptions, authorizeFn){