diff --git a/etc/openstack_deploy/openstack_user_config.yml.example b/etc/openstack_deploy/openstack_user_config.yml.example
index 42c1f07379..eacafba3b3 100644
--- a/etc/openstack_deploy/openstack_user_config.yml.example
+++ b/etc/openstack_deploy/openstack_user_config.yml.example
@@ -144,6 +144,7 @@
 #       Option: container_interface (required, string)
 #       Name of unique interface in containers to use for this network.
 #       Typical values include 'eth1', 'eth2', etc.
+#       NOTE: Container interface is different from host interfaces.
 #
 #       Option: container_type (required, string)
 #       Name of mechanism that connects interfaces in containers to the bridge