diff --git a/README.md b/README.md
index 1cecc63..e97ad65 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,13 @@ You can use this to flash a image **directly to eMMC**, troubleshooting a broken
 - [postmarketOS](https://postmarketos.org) scripts - which is [GPLv2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).
 - [Pine64's kernel fork](https://gitlab.com/pine64-org/linux) - which is [GPLv2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html).
 - [U-Boot](https://github.com/u-boot/u-boot) - which has [multiple licenses](https://github.com/u-boot/u-boot/tree/master/Licenses)
+
+## Building
+
+Run `make` inside this directory and it will build jumpdrive.img.xz that can be flashed to SD.
+
+The dependencies are:
+
+- aarch64-linux-gnu- toolchain
+- u-boot tools
+- mtools