diff --git a/ReadME.txt b/ReadME.txt
index 293dc92..4dc178f 100644
--- a/ReadME.txt
+++ b/ReadME.txt
@@ -1,3 +1,35 @@
-My Hobby OS kernel.
+My Hobby x86-64 OS kernel.
 
-The main purpose is to understand OS kernel design choices and develop reverse-engineering experiences - stick to the assembly debugger.
+# Building and Debugging Guide
+## Environment
+Any Linux distribution / Bash for Windows + GCC cross compiler.
+
+## Required packages
+To compile the kernel, the following modules are required on linux system, please install these:
+
+nasm, xorriso, grub-common, grub-pc-bin
+
+## Cross-compiler
+### Method 1 - Compile one yourself.
+Just follow the instructions here: https://wiki.osdev.org/GCC_Cross-Compiler
+Remember to set the "TARGET" to x86_64-elf instead of i686-elf and build libgcc without redzone https://wiki.osdev.org/Libgcc_without_red_zone.
+
+### Method 2 - Precompiled binaries
+Here is my precompiled cross compiler. Feel free to use it.
+VERSION: GCC 7.3 + Binutils 2.30
+HOST: x86_64-pc-linux-gnu
+CONFIGURED WITH: --target=x86_64-elf --disable-nls --enable-languages=c,c++ --without-headers
+
+1. Download "cross.tar.gz" from https://drive.google.com/file/d/1ssQblBLk7I3ZqFPoeViVlsBvDMXcJFa1/view?usp=sharing
+
+2. Run "tar -xvf cross.tar.gz -C $HOME/opt/cross"
+
+## Compilation
+Run "make all" in the root directory
+The makefile generates secxkrnl.iso (kernel image), secxkrnl.elf(kernel executable), secxkrnl.dmp(kernel disassembly) at the end.
+
+To clean all generated files, run "make clean"
+
+## Running
+On windows run "qemu.bat"
+On linux run "./qemu.bat"