diff --git a/README.md b/README.md
index 0cbb1c1..96affe9 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,10 @@ Register definition for microcontroller families. Usually generated using [`svd2
 
 - [`cortex-m`](https://github.com/japaric/cortex-m) Low level access to Cortex-M processors
 
+### Atmel / Microchip
+
+- [`atsamd21`](https://github.com/wez/atsamd21-rs) Peripheral access API for Atmel SAMD21 microcontrollers.  This git repo hosts both the device crate and the hal.
+
 ### Nordic
 
 - [`nrf51`](https://crates.io/crates/nrf51) Peripheral access API for nRF51 microcontrollers (generated using svd2rust) - ![crates.io](https://img.shields.io/crates/v/nrf51.svg)