Add note on docs

README.md

@@ -23,4 +23,10 @@ These things have been implemented so far:
 
 - The `playsine_events` example is similar to `playsine` but also listens to notifications.
 
-- The `loopback` example shows how to simultaneously capture and render sound, with separate threads for capture and render.
+- The `loopback` example shows how to simultaneously capture and render sound, with separate threads for capture and render.
+
+## Documentation
+The generated documentation is hosted on [GitHub Pages](https://henquist.github.io/wasapi-rs/). This is because the documentation must be built on Windows, and [docs.rs](https://docs.rs/crate/wasapi) only builds on Linux.
+
+The pages are generated from the branch `docs`.
+