diff --git a/README.md b/README.md
index ad22de5..19dd3f9 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+> :warning: **Mozilla’s Firefox Sync Server is not maintained anymore upstream. Packaging is discontinued and installation is discouraged.**
+
 # Mozilla’s Sync Server for YunoHost
 
 [![Integration level](https://dash.yunohost.org/integration/ffsync.svg)](https://dash.yunohost.org/appci/app/ffsync) ![](https://ci-apps.yunohost.org/ci/badges/ffsync.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/ffsync.maintain.svg)  
diff --git a/README_fr.md b/README_fr.md
index 84b3024..102b9fd 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -1,3 +1,5 @@
+> :warning: **Firefox Sync Server n'est plus maintenue par Mozilla. Le packaging de l'app est arrêté et l'installation déconseillée.**
+
 # Serveur de synchronisation de Firefox pour YunoHost
 
 [![Integration level](https://dash.yunohost.org/integration/ffsync.svg)](https://dash.yunohost.org/appci/app/ffsync) ![](https://ci-apps.yunohost.org/ci/badges/ffsync.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/ffsync.maintain.svg)  
diff --git a/manifest.json b/manifest.json
index 0f3bf0d..6b8a227 100644
--- a/manifest.json
+++ b/manifest.json
@@ -30,6 +30,13 @@
     "arguments": {
         "install" : [
             {
+                "name": "warning",
+                "type": "display_text",
+                "ask": {
+                    "en": "Firefox Sync Server is not maintained anymore by Mozilla. Installing is strongly discouraged.",
+                    "fr": "Firefox Sync Server n'est plus maintenue par Mozilla. L'installation est fortement déconseillée."
+                }
+            },            {
                 "name": "domain",
                 "type": "domain",
                 "ask": {