document Cargo features

KodrAus · KodrAus · commit dffa2e314cb2 · 2025-05-15T08:07:45.000+10:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -20,6 +20,15 @@ Add `bitflags` to your `Cargo.toml`:
 version = "2.9.0"
 ```
 
+## Crate features
+
+The `bitflags` library defines a few Cargo features that you can opt-in to:
+
+- `std`: Implement the `Error` trait on error types used by `bitflags`.
+- `serde`: Support deriving `serde` traits on generated flags types.
+- `arbitrary`: Support deriving `arbitrary` traits on generated flags types.
+- `bytemuck`: Support deriving `bytemuck` traits on generated flags types.
+
 ## Generating flags types
 
 Use the [`bitflags`] macro to generate flags types:
