diff --git a/vars/default_vars.yml b/vars/default_vars.yml
index 528c59c03..04bd83186 100644
--- a/vars/default_vars.yml
+++ b/vars/default_vars.yml
@@ -326,6 +326,14 @@ moodle_install: False
 moodle_enabled: False
 # If using Moodle intensively, set apache_high_php_limits in 3-BASE-SERVER
 
+# MongoDB (/library/dbdata/mongodb) is used by Sugarizer:
+# Its 2 settings below are auto-set to True (in roles/0-init/tasks/main.yml) when: sugarizer_enabled
+# The mongodb playbook itself is later invoked by roles/sugarizer/meta/main.yml
+mongodb_install: False
+mongodb_enabled: False
+mongodb_port: 27018
+
+# roles/sugarizer/meta/main.yml auto-invokes 2 above prereqs: mongodb & nodejs
 # Might stall MongoDB on Power Failure: github.com/xsce/xsce/issues/879
 # Sugarizer 1.0.1+ strategies to solve? github.com/iiab/iiab/pull/957
 sugarizer_install: False