diff --git a/doc/PRE_UPGRADE.d/2.12.0~ynh2.md b/doc/PRE_UPGRADE.d/2.12.0~ynh2.md
new file mode 100644
index 0000000..38fa54a
--- /dev/null
+++ b/doc/PRE_UPGRADE.d/2.12.0~ynh2.md
@@ -0,0 +1,11 @@
+### Application is fixed
+
+Since the inception of this app, the upstream code was actually a fork created to make it compatible with YunoHost database.
+It has basically been abandoned for a long time now, and the upstream Owntracks app has changed a lot.
+This upgrade will install both the recorder that stores the location data and the frontend that displays it.
+
+### Data migration is not handled
+
+The new app does not use a database anymore, but a set of files holding all the data.
+If the app was somehow working for you so far, your data will NOT be migrated.
+Export the automated backup made before the update, or make a dedicated one.
diff --git a/manifest.toml b/manifest.toml
index e64efda..864a95a 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -7,7 +7,7 @@ name = "OwnTracks"
 description.en = "Keep track of your location history"
 description.fr = "Gérez votre historique de géolocalisation"
 
-version = "2.12.0~ynh1"
+version = "2.12.0~ynh2"
 
 maintainers = ["tituspijean"]