Update README.md

README.md

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 Super UEFIinSecureBoot Disk
 ===========================
 
-Super UEFIinSecureBoot Disk is a bootable image with GRUB2 bootloader designed to be used as a base for recovery USB flash drives.
+Super UEFIinSecureBoot Disk is a _proof-of-concept (not actively maintained or enhanced)_ bootable image with GRUB2 bootloader designed to be used as a base for recovery USB flash drives.
 
 **Key feature:** disk is fully functional with UEFI Secure Boot mode activated. It can launch any operating system or .efi file, even with untrusted, invalid or missing signature.
 
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 ## Based on:
 
- * [Red Hat shim](https://github.com/rhboot/shim) (v13 for x86_64, v15 for i386), [from Fedora](https://koji.fedoraproject.org/koji/packageinfo?packageID=15107), signed with Microsoft key, for initial boot
+ * [Red Hat shim](https://github.com/rhboot/shim) (v15-8), [from Fedora](https://koji.fedoraproject.org/koji/packageinfo?packageID=15107), signed with Microsoft key, for initial boot
  * Modified [Linux Foundation PreLoader](https://git.kernel.org/pub/scm/linux/kernel/git/jejb/efitools.git) to install circumventing UEFI Security Policy
  * GRUB2 with security bypass patches to chainloader, linux/linuxefi and shim