diff --git a/README.md b/README.md
index 49a0dd50..29ba5abc 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,9 @@ pico-sdk requisites (e.g.
 [documentation](https://datasheets.raspberrypi.com/pico/getting-started-with-pico.pdf). I have been building against 
 the `develop` branch of `pico-sdk`, so I recommend that..
 
+**NOTE: I was building with arm-none-eabi-gcc 9.3.1 .. it seems like other versions may cause problems with binary 
+size, so stick with that for now.** 
+
 For USB keyboard input support, RP2040 Doom currently uses a modified version of TinyUSB included as a submodule. 
 Make sure you have initialized this submodule via `git submodule update --init`