diff --git a/Board-Teensy-3.1-3.5-3.6.md b/Board-Teensy-3.1-3.5-3.6.md
index b5a0686..c3f61de 100644
--- a/Board-Teensy-3.1-3.5-3.6.md
+++ b/Board-Teensy-3.1-3.5-3.6.md
@@ -3,6 +3,8 @@ Cortex M4 based
 * [Teensy 3.5](http://www.pjrc.com/store/teensy35.html)
 * [Teensy 3.6](http://www.pjrc.com/store/teensy36.html)
 
+**Note:** Some of the following instructions require using [Dave Hylands' micropython repository](https://github.com/dhylands?utf8=%E2%9C%93&tab=repositories&q=micropython&type=&language=) as some functionality has not been merged in micropython (see: [#2513](https://github.com/micropython/micropython/pull/2513) [#2519](https://github.com/micropython/micropython/pull/2519) [#2520](https://github.com/micropython/micropython/pull/2520)).
+
 ## Features
 ### Teensy 3.1
 * MK20DX256VLH7 72MHz