diff --git a/docs/Officially_Supported_Microcontrollers.md b/docs/Officially_Supported_Microcontrollers.md
index a594a69..03b5212 100644
--- a/docs/Officially_Supported_Microcontrollers.md
+++ b/docs/Officially_Supported_Microcontrollers.md
@@ -13,6 +13,10 @@ Features include
 Downsides
 - $25 USD per microcontroller at most retailers
 
+*Important*
+Nice!Nano has limited flash memory which does not fit CircuitPython, adafruit-ble, and KMK by default. You will need to use pre-compiled KMK to get it to fit. Grab [compatible mpy-cross](https://adafruit-circuit-python.s3.amazonaws.com/index.html?prefix=bin/mpy-cross/) and run `make compile` to generate `.mpy` version of KMK files before copying them over. 
+
+
 Common Retailers
 [Boardsource](https://boardsource.xyz/store/5f4a1733bbaa5c635b83ed67)
 [NiceKeyboards](https://nicekeyboards.com/collections/group-buy/products/nice-nano-v1-0).