README: update for elftool

README.md

@@ -80,12 +80,17 @@ The AK2 repo includes my latest static ARM builds of `mkbootimg`, `unpackbootimg
 https://forum.xda-developers.com/showthread.php?t=2073775 (Android Image Kitchen thread)  
 https://forum.xda-developers.com/showthread.php?t=2239421 (Odds and Ends thread)
 
+Or as linked, here:
+
+https://forum.xda-developers.com/xperia-j-e/development/arm-elftool-pack-unpack-boot-image-sony-t2146022 (ElfTool)
+
 Optional supported binaries which may be placed in /tools to enable built-in expanded functionality are as follows:
 * `mkbootfs` - for broken recoveries, or, booted flash support for a script or app via bind mounting to a /tmp directory
 * `flash_erase`, `nanddump`, `nandwrite` - MTD block device support for devices where the `dd` command is not sufficient
 * `pxa-unpackbootimg`, `pxa-mkbootimg` - Samsung/Marvell PXA1088/PXA1908 boot.img format variant support
 * `dumpimage`, `mkimage` - DENX U-Boot uImage format support
 * `unpackelf` - Sony ELF kernel.elf format support, repacking as AOSP standard boot.img for unlocked bootloaders
+* `elftool`, `unpackelf` - Sony ELF kernel.elf format support, repacking as ELF for older Sony devices
 * `mkmtkhdr` - MTK device boot image section headers support
 * `futility` + `chromeos` test keys directory - Google ChromeOS signature support
 * `BootSignature_Android.jar` + `avb` keys directory - Google Android Verified Boot (AVB) signature support