diff --git a/virtual.mdwn b/virtual.mdwn
index 70055e846b124b2d6911e76d84a54e1e22eb016b..323cc34ef887fbe11457cbe38a07f52018ead968 100644
--- a/virtual.mdwn
+++ b/virtual.mdwn
@@ -67,4 +67,4 @@ Applications:
 Other implementations:
 
 * [Marco Carnut: Ambiente "Auto-Limpante" via Virtualização Ultra-Leve Descartável - Tempest Blog](http://blog.tempest.com.br/marco-carnut/ambiente-auto-limpante-via-virtualizacao-ultra-leve-descartavel.html).
-* [Subgraph OS and Mail](https://subgraph.com/sgos/index.en.html).
+* [Subgraph OS and Mail](https://subgraph.com/sgos/index.en.html) with [oz](https://github.com/subgraph/oz) sandboxing system.