Update README.md

Author: logonoff

README.md

@@ -1,13 +1,15 @@
 ## GRUB2 Theme for Framework 13 (2.2k screen)
 
-Theme based on [grub2-deadpool-theme](https://github.com/bishwassagar/grub2-deadpool-theme) with a background designed to look seamlesss with the boot logo of the Framework Laptop 13 (original or matte display) 
+Theme based on [grub2-deadpool-theme](https://github.com/bishwassagar/grub2-deadpool-theme) with a background designed to look seamlesss with the boot logo of the Framework Laptop 13 (original or matte display)
 
 ### Screenshots
 
 ![Framework GRUB Theme](https://i.imgur.com/mYg5mI6.png)
 
 ### Installation/Update
 
+#### Install GRUB theme
+
 ```sh
 git clone https://github.com/logonoff/framework-13-grub-theme.git
 cd framework-13-grub-theme
@@ -17,4 +19,18 @@ cd ..
 rm -r framework-13-grub-theme
 ```
 
-### Done!!!
+#### (Optional) enable custom EFI firmware icon
+Tested on Fedora 40. Apply the following diff to `/etc/grub.d/30_uefi-firmware`:
+
+```diff
+<   menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
+---
+>   menuentry '$LABEL' --class efi \$menuentry_id_option 'uefi-firmware' {
+```
+Then update GRUB:
+
+```sh
+sudo grub2-mkconfig -o /boot/grub2/grub.cfg
+```
+
+#### Done!!!