Update build instructions for the r2k plugin

r2k/linux/README.md

@@ -1,7 +1,30 @@
 # r2k
-kernel module for radare2
 
-This module is going to be part of radare2 (https://github.com/radareorg/radare2).
+kernel module for radare2 r2k://
+
+This module is part of radare2 (https://github.com/radareorg/radare2).
+
+## Build
+
+To compile this plugin just run `make` on your favourite Linux box.
+
+```bash
+$ make
+```
+
+To insert the module on modern kernels you need to:
+
+* disable codesign (append `module.sig_enforce=0` in the /boot/grub.cfg cmdline)
+* disable secure boot (in the BIOS/UEFI)
+
+After this you may be able to run the following lines:
+
+```bash
+$ sudo rmmod r2kmod
+$ sudo insmod r2kmod.ko
+```
+
+## Features
 
 It will work together with an userland program (https://github.com/radareorg/radare2/blob/master/libr/io/p/io_r2k.c)