Document no_std support
@@ -31,6 +31,18 @@ For more information about how you can use futures with async I/O you can take a
look at [https://tokio.rs](https://tokio.rs) which is an introduction to both
the Tokio stack and also futures.
+### Feature `use_std`
+
+`futures-rs` works without the standard library, such as in bare metal environments.
+However, it has a significantly reduced API surface. To use `futures-rs` in
+a `#[no_std]` environment, use:
+
+```toml
+[dependencies.futures]
+version = "..."
+no-default-features = true
+```
+
# License
`futures-rs` is primarily distributed under the terms of both the MIT license and
