diff --git a/src/Model/Currency.php b/src/Model/Currency.php
index 66f7a30..34975fb 100644
--- a/src/Model/Currency.php
+++ b/src/Model/Currency.php
@@ -22,4 +22,5 @@ class Currency
     const JPY = 'JPY';
     const EGP = 'EGP';
     const MXN = 'MXN';
+    const RON = 'RON';
 }