diff --git a/conf/app-default.conf b/conf/app-default.conf
index c6bebac..7635ac1 100644
--- a/conf/app-default.conf
+++ b/conf/app-default.conf
@@ -13,11 +13,11 @@ adminUsername=admin
 db.host=localhost
 db.port=27017
 db.dbname=leanote # required
-db.username=root
-db.password=root123
-# or you can set the mongdb url
+db.username=root # if not exists, please leave blank
+db.password=root123 # if not exists, please leave blank
+# or you can set the mongdb url for more complex needs the format is:
 # mongodb://myuser:mypass@localhost:40001,otherhost:40001/mydb
-db.url=mongodb://root:root123@localhost:27017/leanote
+# db.url=mongodb://root:root123@localhost:27017/leanote
 
 # email
 email.host=