Document required Rust version
@@ -19,6 +19,8 @@ However you also need to have the SDL2 libraries installed on your
system. The best way to do this is documented [by the SDL2
crate](https://github.com/AngryLawyer/rust-sdl2#user-content-requirements).
+You will also need to use the [nightly build of Rust](https://github.com/rust-lang-nursery/rustup.rs/blob/master/README.md#working-with-nightly-rust) to use orbtk.
+
## Examples
You find the examples in the `examples/` directory.
