README.md updated

README.md

@@ -5,9 +5,10 @@ It is based on [wojtek77/chat](https://github.com/wojtek77/chat), itself based o
 
 ## Features
 
-- No need for users to register. Just need the web address.
+- Simple web chat: only requires a browser ; no XMPP application
+- No need for users to register. Just need the web address. But optional authorisation control.
 - On connection, the page is feeded with the 50 last messages of the day
-- Args are in the URL as *get* arguments, so that you can share the URL or make it a favorite    
+- Args are in the URL as *get* arguments, so that you can share the URL or make it a favorite to avoid filling a form.  
 Example : `https://yourdomain.org/minchat/?room=Living&name=John`
 - Optionaly multi room
 
@@ -18,7 +19,7 @@ Or on ssh : `sudo yunohost app install https://github.com/chtixof/minchat_ynh`
 ### Otherwise
 Download, unzip and just copy the content of the `sources` folder to any folder of your web site.
 ## Setup
-On the application folder of your site, edit the file `conf/setup.ini`. The interesting parameter is `auth` that indicates which user is authorized to which room.
+The setup is optional. If you leave it as is, there is a single unnamed room, opened to all users. If you want to customize the access control, edit the file `conf/setup.ini`. The interesting parameter is `auth` that indicates which user is authorized to which room.
 
 In this example `auth = John:Game,Mary:Game,John:Family,Tim:Family,admin:,:Public`,
 - John can access the Game room, the Family room and the Public room
@@ -27,7 +28,5 @@ In this example `auth = John:Game,Mary:Game,John:Family,Tim:Family,admin:,:Publi
 - admin can access all rooms
 - other users can only acccess the Public room
 
-If `auth` is not set (default), there is a single unnamed room, opened to all users.
-
 ## Screen shot
 ![screenshot](https://raw.githubusercontent.com/chtixof/databank/master/minchat_ynh/minchat_ynh_screenshot01.gif)