diff --git a/mcu-echo.yaml b/mcu-echo.yaml
index ca4fe93..e60e5a6 100644
--- a/mcu-echo.yaml
+++ b/mcu-echo.yaml
@@ -1,12 +1,12 @@
 ---
-# Hardware: M5Stack ATOM Echo
+# Hardware: Xiaomi Mijia Gateway, brain transplant: M5Stack ATOM Echo (kept the speaker, LEDs and PSU)
 # Pinout:
 #   GPIO12                             -> Button (binary_sensor gpio) (inverted)
 #   GPIO19                             -> speaker_bus (i2s_audio i2s_bclk_pin)
-#   GPIO21                             -> led_red (output ledc)
+#   GPIO21  Gateway LED red            -> led_red (output ledc)
 #   GPIO22                             -> speaker_id (speaker i2s_audio i2s_dout_pin)
-#   GPIO23                             -> led_status (light status_led); led_blue (output ledc)
-#   GPIO25                             -> led_green (output ledc)
+#   GPIO23  Gateway LED blue           -> led_status (light status_led); led_blue (output ledc)
+#   GPIO25  Gateway LED green          -> led_green (output ledc)
 #   GPIO26  Grove SDA                  -> i2c (i2c sda)
 #   GPIO32  Grove SCL                  -> i2c (i2c scl)
 #   GPIO33                             -> speaker_bus (i2s_audio i2s_lrclk_pin)