docs(firmware): add warning for NixOS users

docs/guides/wifi-bluetooth.md

@@ -2,11 +2,14 @@
 
 # Introduction
 
-This page is a step by step guide to get Wi-Fi and Bluetooth working on T2 Macs. This guide is also applicable to **iMac19,1** and **iMac19,2**, which are T1 Intel Macs. This guide is NOT applicable for rest T1 and older Intel Macs.
+This page is a step by step guide to get Wi-Fi and Bluetooth working on T2 Macs. This guide is also applicable to **iMac19,1** and **iMac19,2**, which are T1 Intel Macs. This guide is NOT applicable for the rest of the T1 and older Intel Macs.
 
 !!! Warning "Arch/EndeavourOS"
     If you're running Arch or EndeavourOS and have `apple-bcm-firmware` installed, you do not need to follow this guide.
 
+!!! Warning "NixOS"
+    NixOS users please first read the [distribution specific guide on firmware](../distributions/nixos/installation.md#wi-fi-and-bluetooth-setup) before following instructions on this page.
+
 ## Ensure Kernel Supports OTP Firmware Selection
 
 Check if this command outputs any lines: `modinfo brcmfmac | grep 4387` If it doesn't output anything, then upgrade your kernel.