diff --git a/README.md b/README.md
index 6315578..5d2fb96 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,8 @@ esptool --port COM5 erase_flash
 
 **NOTE:** You should change the serial port listed here to the one which corresponds to your connected Inkplate device.
 
+**NOTE:** If you see a message like `A fatal error occurred: Failed to connect to Espressif device: No serial data received.` you may need to wake up your InkPlate by pressing the button next to the USB port.
+
 Now it's possible to flash MicroPython firmware. Do so by running this command:
 ```
 // Linux/Mac