diff --git a/lorawan.h b/lorawan.h
index fdbcf45bf911ab13cf01b6ab94aaf66cca6be952..b2cfdab07fb97363dd70e9ac73078881ba54cc2c 100644
--- a/lorawan.h
+++ b/lorawan.h
@@ -2,6 +2,8 @@
 #define AMPEL_LORAWAN_H_
 #if defined(ESP32)
 #include <Arduino.h>
+// Requires "MCCI LoRaWAN LMIC library", which will be automatically used with PlatformIO but should be added in "Arduino IDE".
+// Tested successfully with v3.2.0 and connected to a thethingsnetwork.org app.
 #include <lmic.h>
 #include <hal/hal.h>
 #include <SPI.h>