Adding a note for Haswell users preventing unbootable system

Author: watermel0l

config.plist/haswell.md

@@ -151,7 +151,7 @@ We also add 3 more properties, `framebuffer-patch-enable`, `framebuffer-stolenme
 `layout-id`
 
 * Applies AppleALC audio injection, you'll need to do your own research on which codec your motherboard has and match it with AppleALC's layout. [AppleALC Supported Codecs](https://github.com/acidanthera/AppleALC/wiki/Supported-codecs).
-* You can delete this property outright as it's unused for us at this time
+* You can delete this property outright as it's unused for us at this time. If deleting 'layout-id' leaves PciRoot(0x0)/Pci(0x1b,0x0) dictionary empty, delete it as well. You might end up with unbootable system otherwise.
 
 For us, we'll be using the boot-arg `alcid=xxx` instead to accomplish this. `alcid` will override all other layout-IDs present. More info on this is covered in the [Post-Install Page](https://dortania.github.io/OpenCore-Post-Install/)