diff --git a/tools/virsh.pod b/tools/virsh.pod
index 00d93781ac..279bbe7dec 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -775,7 +775,11 @@ the guest OS via an agent. If unspecified, 'lease' is the default.
 
 =item B<domifstat> I<domain> I<interface-device>
 
-Get network interface stats for a running domain.
+Get network interface stats for a running domain. The network
+interface stats are only available for interfaces that have a
+physical source interface. This does not include, for example, a
+'user' interface type since it is a virtual LAN with NAT to the
+outside world.
 
 =item B<domif-setlink> I<domain> I<interface-device> I<state> [I<--config>]