diff --git a/app_mattermost.md b/app_mattermost.md
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+# Mattermost
+
+[![Install mattermost with YunoHost](https://install-app.yunohost.org/install-with-yunohost.png)](https://install-app.yunohost.org/?app=mattermost) [![Integration level](https://dash.yunohost.org/integration/mattermost.svg)](https://dash.yunohost.org/appci/app/mattermost)
+
+### Index
+
+- [Useful links](#useful-links)
+
+Mattermost is a decentralized team communication software. For Slack enthusiasts, importing your data is possible, allowing a smooth transition to this free tool.
+The platform allows :
+
+* The sharing of messages and files on different devices: PCs, computers and tablets thanks to dedicated applications.
+* The formatting of messages is done with the Markdown language.
+* Continuous archiving and instant search, and support for notifications and integrations with your existing tools.
+
+## Useful links
+
++ Website: [mattermost.com/](https://mattermost.com/)
++ Official documentation: [docs.mattermost.com/guides/user.html](https://docs.mattermost.com/guides/user.html)
++ Application software repository: [github.com - YunoHost-Apps/mattermost](https://github.com/YunoHost-Apps/mattermost_ynh)
++ Fix a bug or an improvement by creating a ticket (issue): [github.com - YunoHost-Apps/mattermost/issues](https://github.com/YunoHost-Apps/mattermost_ynh/issues)
diff --git a/app_mattermost_fr.md b/app_mattermost_fr.md
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+# Mattermost
+
+[![Install mattermost with YunoHost](https://install-app.yunohost.org/install-with-yunohost.png)](https://install-app.yunohost.org/?app=mattermost) [![Integration level](https://dash.yunohost.org/integration/mattermost.svg)](https://dash.yunohost.org/appci/app/mattermost)
+
+### Index
+
+- [Liens utiles](#liens-utiles)
+
+Mattermost est un logiciel décentralisé de communication en équipe. Pour les adeptes de Slack, l'importation de vos données est possible, permettant de faire la transition vers cet outil libre en douceur.
+La plate-forme permet :
+
+* Le partage de messages et de fichiers sur différents appareils : PC, ordiphones et tablettes grâce aux applications dédiées.
+* La mise en forme des messages se fait avec le langage Markdown.
+* L'archivage continu et la recherche instantanée, et la prise en charge les notifications et les intégrations avec vos outils existants.
+
+## Liens utiles
+
++ Site web : [mattermost.com/](https://mattermost.com/)
++ Documentation officielle : [docs.mattermost.com/guides/user.html](https://docs.mattermost.com/guides/user.html)
++ Dépôt logiciel de l'application : [github.com - YunoHost-Apps/mattermost](https://github.com/YunoHost-Apps/mattermost_ynh)
++ Remonter un bug ou une amélioration en créant un ticket (issue) : [github.com -YunoHost-Apps/mattermost/issues](https://github.com/YunoHost-Apps/mattermost_ynh/issues)
diff --git a/images/mattermost_logo.svg b/images/mattermost_logo.svg
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+
+
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