diff --git a/Makefile b/Makefile
index 88426ed..8144e37 100755
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,9 @@
+ifeq ($(ANDROID_NDK_ROOT),)
+$(error Error : Set the env variable 'ANDROID_NDK_ROOT' with the path of the Android NDK (version 20))
+endif
 
+#ARM thumb mode
+DEVKITARM := $(TOOLCHAINENV)/gcc-arm-none-eabi-10-2020-q4-major
 
 CC = $(DEVKITARM)/bin/arm-none-eabi-gcc
 LD = $(DEVKITARM)/bin/arm-none-eabi-ld
diff --git a/README.md b/README.md
index fdd6cef..8e696a4 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,9 @@ A fork of early commit of [hekate](https://github.com/CTCaer/hekate/).
 I am studying its process.
 
 ## Build
-### **Archlinux** 
+
 ```shell
-sudo pacman -S arm-none-eabi-newlib arm-none-eabi-gcc arm-none-eabi-binutils #Build Toolchain
-mkdir build
+mkdir -p build
+export ANDROID_NDK_ROOT=$TOOLCHAINENV/android-ndk-r21_Linux
 make
-...#Run the payload
 ```