diff --git a/vars/ubuntu-17.yml b/vars/ubuntu-17.yml
index be1c6ef0a..fe0c4288e 100644
--- a/vars/ubuntu-17.yml
+++ b/vars/ubuntu-17.yml
@@ -2,9 +2,12 @@ is_debuntu: True
 is_ubuntu: True
 is_ubuntu_17: True
 
+# 2019-01-31: These apply if-only-if named_install and/or dhcpd_install are True
+# (This is quite rare now that vars/default_vars.yml sets dnsmasq_install: True)
 dns_service: bind9
 dns_user: bind
 dhcp_service: isc-dhcp-server
+
 proxy: squid
 proxy_user: proxy
 apache_service: apache2