diff --git a/README.md b/README.md
index c911245..884bb67 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ https://micropython.org/download/RPI_PICO_W/
 Pi Pico W datasheet
 https://datasheets.raspberrypi.com/picow/pico-w-datasheet.pdf
 
+PCB 51x21mm, 1mm hole 20x8(10) 2.54 pitch grid 
+
 Pi Pico BLE:
 https://electrocredible.com/raspberry-pi-pico-w-bluetooth-ble-micropython/