diff --git a/conf/app.conf b/conf/app.conf
index ea856d2..05acda1 100644
--- a/conf/app.conf
+++ b/conf/app.conf
@@ -18,7 +18,7 @@ db.password= # if not exists, please leave it blank
 # or you can set the mongodb 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.urlEnv=${MONGODB_URL} # set url from env
+# db.urlEnv=${MONGODB_URL} # set url from env. eg. mongodb://root:root123@localhost:27017/leanote
 
 # You Must Change It !! About Security!!
 app.secret=V85ZzBeTnzpsHyjQX4zukbQ8qqtju9y2aDM55VWxAH9Qop19poekx3xkcDVvrD0y