diff --git a/conf/settings.py b/conf/settings.py
index 9dc44ee..b7506b6 100644
--- a/conf/settings.py
+++ b/conf/settings.py
@@ -34,6 +34,8 @@ assert LOG_FILE.is_file(), f'File not exists: {LOG_FILE}'
 PATH_URL = '__PATH_URL__'  # $YNH_APP_ARG_PATH
 PATH_URL = PATH_URL.strip('/')
 
+YNH_CURRENT_HOST = '__YNH_CURRENT_HOST__'  # YunoHost main domain from: /etc/yunohost/current_host
+
 # -----------------------------------------------------------------------------
 # config_panel.toml settings:
 
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 24083aa..b14c5d7 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -11,6 +11,10 @@ admin=$YNH_APP_ARG_ADMIN
 is_public=$YNH_APP_ARG_IS_PUBLIC
 app=$YNH_APP_INSTANCE_NAME
 
+# Transfer the main SSO domain to the App:
+ynh_current_host=$(cat /etc/yunohost/current_host)
+__YNH_CURRENT_HOST__=${ynh_current_host}
+
 #=================================================
 # ARGUMENTS FROM CONFIG PANEL
 #=================================================