diff --git a/group_vars/all.docker.yml.sample b/group_vars/all.docker.yml.sample
index d7e252ea9..6cbc93a58 100644
--- a/group_vars/all.docker.yml.sample
+++ b/group_vars/all.docker.yml.sample
@@ -6,6 +6,7 @@ dummy:
 ##########
 #docker: true
 #ceph_docker_dev_image: false
+#ceph_docker_registry: docker.io
 
 #######
 # MON #