diff --git a/README.md b/README.md
index fd23441..d1b3b4c 100644
--- a/README.md
+++ b/README.md
@@ -190,6 +190,7 @@ See also [A comparison of operating systems written in Rust](https://github.com/
 * [redox-os/redox](https://github.com/redox-os/redox) — [<img   src="https://api.travis-ci.org/redox-os/redox.svg?branch=master">](https://travis-ci.org/redox-os/redox)
 * [thepowersgang/rust_os](https://github.com/thepowersgang/rust_os) — [<img src="https://api.travis-ci.org/thepowersgang/rust_os.svg?branch=master">](https://travis-ci.org/thepowersgang/rust_os)
 * [tock/tock](https://github.com/tock/tock) — A secure embedded operating system for Cortex-M based microcontrollers
+* [nebulet/nebulet](https://github.com/nebulet/nebulet) — A microkernel that implements a WebAssembly "usermode" that runs in Ring 0.
 
 ### System tools