Modified Advanced Baremetal support description
diff --git a/source/about.rst b/source/about.rst
index 1108df9..b9a5999 100644
--- a/source/about.rst
+++ b/source/about.rst
@@ -145,7 +145,8 @@
agent for whitebox switch. When using this feature, baremetal instances gain
Layer 2 isolation methods provided by CloudStack advanced networking which is
particularly useful in public cloud that wants to provide baremetal as a
-service.
+service. This feature currently requires a VMware virtual router, so is only
+supported by that hypervisor.
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