diff --git a/README.md b/README.md
index 2d51b42..7e3c0ee 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,17 @@ TWI. Though, this is not limited to the Si5351 board as it is designed
 to be universal usable.
 
 ## Board
-The board is populated with an ATmega328(p), a display and its
+The board is populated with an ATmega328p, a display and its
 backlight driver, a switchable rotary encoder and powered by a mini
 USB port. All unneeded MCU pins are accessible via pin headers.
 
+## Firmware
+Currently there are two different firmwares. The older one which is
+written in C and is not finished, and the newer one which is in an
+early but functioning state and written in Rust.
+
+### The Rust Firmware
+To flash the firmware, connect the ICSP pins of the board to the
+programmer and inside the `firmware/rust/` directory run `cargo make
+all`. This burns the fuses, writes the the default values to the
+eeprom and flashes the firmware.