diff --git a/README.md b/README.md
index c28b499..166f222 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ COMPATIBLE BOARDS AND PINS:
 * Trinket M0: pin 4 (can't use simultaneously with I2C, SPI or Serial1).
 * Gemma M0: pin D0 (can't use simultaneously with I2C, SPI or Serial1).
 * QT Py: MOSI\* and pin 16 (underside pad, can't use w/optional SPI flash).
+* Arduino NANO 33 IoT: pins 4, 6, 7, A2, A3, MOSI*.
 
 \* If using the MOSI pin on these boards, the corresponding SPI peripheral is
 not usable. A few add-ons (usually TFT display shields/wings) rely on SPI,