diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..cc9afb6
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,8 @@
+# Web environment (Vite)
+VITE_SUPABASE_URL=
+VITE_SUPABASE_ANON_KEY=
+
+# API config (optional)
+# MQTT_BROKER_HOST=mqtt
+# MQTT_BROKER_PORT=1883
+