diff --git a/README.md b/README.md
index 4b7f017..955adff 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,10 @@ Example : `https://yourdomain.org/minchat/?room=Living&name=John`
 #### On Yunohost
 Via the admin web console, type in: <https://github.com/chtixof/minchat_ynh>  
 Or on ssh : `sudo yunohost app install https://github.com/chtixof/minchat_ynh`
+
+Upgrade: `sudo yunohost app upgrade minchat -u https://github.com/chtixof/minchat_ynh`
+CAUTION: BEFORE YOU UPGRADE, PLEASE MAKE A BACKUP OF conf/setup.ini : IT IS OVERWRITTEN (BUG)
+
 #### Otherwise
 Download, unzip and just copy the content of the `sources` folder to any folder of your web site.
 ## Setup
@@ -34,4 +38,4 @@ In this example `auth = John:Game,John:Family,Mary:Game,Tim:Family,admin:*,*:Pub
 
 ## Hints for users
 - The URLs you send are linked or transformed to images when preceeded by a !
-- If multiple rooms are allowed by the administrator in the setup.ini, you can have several tabs opened to different rooms in the same browser
\ No newline at end of file
+- If multiple rooms are allowed by the administrator in the setup.ini, you can have several tabs opened to different rooms in the same browser