diff --git a/README.md b/README.md
index 545a882..c0a5f1a 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,9 @@ This repository contains the [NXP Kinetis SDK](http://www.nxp.com/products/softw
 The SDK has been generated by the [Kinetis Export tool](https://kex.nxp.com/), and was cloned here solely for the purposes of easily including it from other repositories as a Git submodule.
 
 The KSDK uses [open source licenses](https://community.freescale.com/message/613019#613019).
+
+## Modifications
+
+`startup_MK22F51212.S` [has been modified](https://github.com/UltimateHackingKeyboard/KSDK_2.0_MK22FN512xxx12/commit/e522962619d01c6fe01f43af92573389968c7dcd?diff=split#diff-b8d7fda6da5d964a20a749774afb28f3) in order to relocate the [Ultimate Hacking Keyboard firmware](https://github.com/UltimateHackingKeyboard/firmware) that links to the KSDK. This way, the UHK firmware works with [KBOOT](http://www.nxp.com/applications/solutions-for-the-iot-and-adas/smart-connected-solutions-for-the-iot/smart-cities-in-the-age-of-iot/smart-energy/off-grid-solar-power-inverters/kinetis-bootloader:KBOOT).
+
+The original content of `startup_MK22F51212.S` is available in `startup_MK22F51212.original.S`