Update README.md
diff --git a/README.md b/README.md
index 75b07dd..7bed9c5 100644
--- a/README.md
+++ b/README.md
@@ -6,11 +6,14 @@
Additional design notes, presentations, and other collateral are
also available at http://xosproject.org and http://cord.onosproject.org.
-One quick way to get started is to build and run the containers in
-`containers/` (see the README in that directory for more information).
-
-Another quick way to get started is to look at the collection of
+The best way to get started is to look at the collection of
canned configurations in `xos/configurations/`. The `cord`
configuration in that directory corresponds to our current
CORD development environment, and the `README.md` you'll find there
will help you get started.
+
+Source tree layout:
+ * applications -- stand-alone applications that run on top of XOS.
+ * containers -- common Dockerfiles used by various XOS configurations
+ * views -- mechanisms to extend XOS with customized views
+ * xos -- XOS internals