diff --git a/ESP32/esp32.h b/ESP32/esp32.h
index 4aa43e1..b7554d8 100644
--- a/ESP32/esp32.h
+++ b/ESP32/esp32.h
@@ -15,8 +15,8 @@
 
 // #define NEOPIXELS_PIN 24
 
-#define HEARTBEAT_PIN LED_BUILTIN
-// #define HEARTBEAT_PIN 18
+// #define HEARTBEAT_PIN LED_BUILTIN
+#define HEARTBEAT_PIN 25
 
 // #define CONSOLE_SERIAL_RX 16
 // #define CONSOLE_SERIAL_TX 17
diff --git a/README.md b/README.md
index 2cdd9ff..a28b92d 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,9 @@ Wiring of SDCARD (or use disk-images exported via NBD over wifi using nbdkit (be
 * SS  : 5
 * and of course connect VCC/GND of the SD-card
 
+Heart beat LED:
+* pin 25
+
 Wiring of the MAX232 connection:
 * TX  : 17
 * RX  : 16