diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 780e48d..aae4453 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -21,6 +21,9 @@
 build_timeout=600
 catalog_type=compute
 create_image_enabled=true
+# For resize to work with libvirt/kvm, one of the following must be true:
+# Single node: allow_resize_to_same_host=True must be set in nova.conf
+# Cluster: the 'nova' user must have scp access between cluster nodes
 resize_available=true
 
 [image]