diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 1095e77..27d65e6 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -432,6 +432,11 @@
 # value)
 #attach_encrypted_volume = true
 
+# Does the test environment support creating instances with multiple
+# ports on the same network? This is only valid when using Neutron.
+# (boolean value)
+#allow_duplicate_networks = false
+
 
 [dashboard]