diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index d04fbb31c..c087833d4 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -226,22 +226,26 @@ exFAT_enabled: True
 
 # 3-BASE-SERVER
 
-# 2020-01-13: Vars unused
+# 2020-01-13: Both vars unused
 admin_console_install: True
 admin_console_enabled: True
 
-nginx_port: 80
-nginx_interface: 0.0.0.0
+# 2019-01-13: IIAB's use of NGINX is still evolving -- please review this
+# evolving doc: https://github.com/iiab/iiab/blob/master/roles/nginx/README.md
 nginx_install: True
 nginx_enabled: True
+nginx_port: 80
+nginx_interface: 0.0.0.0
 nginx_config_dir: /etc/nginx/conf.d
+nginx_log_dir: /var/log/nginx
 
 # See also Apache vars {default_language, language_priority} @ top of this file
-#
 apache_install: True
 apache_enabled: False
-apache_port: 8090    # NGINX proxies to this IP address, for legacy IIAB services still requiring Apache
-apache_interface: 127.0.0.1
+#
+# NGINX proxies to Apache for legacy IIAB services, using:
+apache_port: 8090
+apache_interface: 127.0.0.1    # 2020-01-13: Var unused
 #
 # For schools that use WordPress/Nextcloud/Moodle intensively:  iiab/iiab#1147
 apache_high_php_limits: False