diff --git a/README b/README
index 979c6c3..0f71630 100644
--- a/README
+++ b/README
@@ -7,7 +7,8 @@ To build the  world use `./stage0'.  You need an  x86_64 host to build
 morpheus.  Please review the  `prepare-env' script and adjust anything
 needed.
 
-Morpheus has been build-tested on Debian 7.0 and Archlinux.
+Morpheus has  been build-tested  on Debian  7.0, Archlinux  and Ubuntu
+13.04.
 
 To build specific packages: