diff --git a/vars/centos-7.yml b/vars/centos-7.yml
index c2efe174c..349a6e33e 100644
--- a/vars/centos-7.yml
+++ b/vars/centos-7.yml
@@ -2,8 +2,11 @@ is_redhat: True
 is_centos: True
 is_centos_7: 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: named
 dns_user: named
+
 proxy: squid
 proxy_user: squid
 apache_service: httpd