diff --git a/mongodb-org/defaults/main.yml b/mongodb-org/defaults/main.yml
index 68b0abc6..699c5a50 100644
--- a/mongodb-org/defaults/main.yml
+++ b/mongodb-org/defaults/main.yml
@@ -18,6 +18,7 @@ mongodb_log_retain_days: 7
 mongodb_directoryperdb: False
 mongodb_conf_file: /etc/mongod.conf
 mongodb_daemon: /usr/bin/mongod
+# --setParameter newCollectionsUsePowerOf2Sizes=false is useful if there are disk space constraints.
 mongod_additional_options: ""
 mongodb_allowed_hosts:
   - 127.0.0.1/8