From 148e0c89267fbff13d58f583b2346a1c3ab355ba Mon Sep 17 00:00:00 2001
From: Token2 <6784409+token2@users.noreply.github.com>
Date: Thu, 11 Dec 2025 11:26:11 +0100
Subject: [PATCH] Update COMPILING.md

---
 COMPILING.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/COMPILING.md b/COMPILING.md
index dc59a32..cc9c77a 100644
--- a/COMPILING.md
+++ b/COMPILING.md
@@ -97,6 +97,11 @@ enum  {
     MODE_ALWAYS_OFF  = 0
 };
 ```
+By default the LED are not set as dimmable, and have to be set using the comissioner tool. To enable it in advance in the firmware, change 
+
+`#define PHY_OPT_DIMM    0x1` (instead of `#define PHY_OPT_DIMM    0x2`)
+
+in `pico-fido/pico-keys-sdk/src/fs/phy.h`
 
 Optionally, modify USB descriptor values in pico-keys-sdk/src/usb/usb_descriptors.c