diff --git a/README.md b/README.md
index 29dd962..56cbc31 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,20 @@ Mattermost requires:
 * A x86_64 system (check with `uname -m`),
 * MySQL 5.6 or higher (check with `mysql --version`).
 
-## Installation
+## Installing
 
 You can either :
 
 * Install from the Yunohost Admin web interface, by providing this URL: `https://github.com/kemenaran/mattermost_ynh`
 * Install from the command-line: `yunohost app install https://github.com/kemenaran/mattermost_ynh`
 
+## Upgrading
+
+Mattermost upgrades tend to work only from one minor version to the other (3.0 to 3.1, 3.1 to 3.2, etc).
+
+**Important**: to upgrade from Mattermost 2.2, you will need an extra manual step.
+Run the upgrade from Yunohost, then follow [this guide](https://docs.mattermost.com/administration/upgrade.html).
+
 ## What works
 
 * Installation on domain's root
diff --git a/VERSION b/VERSION
index ccbccc3..4a36342 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.0
+3.0.0