diff --git a/src/auth/index.js b/src/auth/index.js
index 7b417ac107c1473001cbbc25430e23c4a11bdec7..4ed760d9e1a205ca1637657e461471a97e3d1fe4 100644
--- a/src/auth/index.js
+++ b/src/auth/index.js
@@ -10,7 +10,7 @@ var bigi = require('bigi'),
 	PublicKey = require('./ecc/src/key_public'),
   hash = require('./ecc/src/hash');
 
-var Auth = {};
+var Auth = { Signature };
 var transaction = operations.transaction;
 var signed_transaction = operations.signed_transaction;