diff --git a/api-ref/source/os-virtual-interfaces.inc b/api-ref/source/os-virtual-interfaces.inc
index 10bb6927f9e3..44c95b6f1dcf 100644
--- a/api-ref/source/os-virtual-interfaces.inc
+++ b/api-ref/source/os-virtual-interfaces.inc
@@ -6,6 +6,13 @@
 
 Lists virtual interfaces for a server instance.
 
+.. note::
+    This API is only implemented for the nova-network service and will result
+    in a 400 error response if the cloud is using the Neutron networking
+    service. Use the Neutron ``ports`` API to list ports for a given server by
+    filtering ports based on the port ``device_id`` which is the
+    ``{server_id}``.
+
 List Virtual Interfaces
 =======================