diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 0e11b90..5d396a4 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -664,6 +664,9 @@
 # Directory containing image files (string value)
 #img_dir=/opt/stack/new/devstack/files/images/cirros-0.3.1-x86_64-uec
 
+# QCOW2 image file name (string value)
+#qcow2_img_file=cirros-0.3.1-x86_64-disk.img
+
 # AMI image file name (string value)
 #ami_img_file=cirros-0.3.1-x86_64-blank.img