diff --git a/Cargo.toml b/Cargo.toml
index 57fc216..a85413a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,25 +6,28 @@ Compatibility crate for using RustCrypto's traits with the cryptographic
 algorithm implementations from *ring*
 """
 authors = ["RustCrypto Developers"]
-edition = "2018"
 license = "Apache-2.0 OR MIT"
 readme = "README.md"
 documentation = "https://docs.rs/ring-compat"
 repository = "https://github.com/RustCrypto/ring-compat"
 categories = ["cryptography", "no-std"]
 keywords = ["aead", "digest", "crypto", "ring", "signature"]
+edition = "2021"
+rust-version = "1.56"
 
 [dependencies]
+generic-array = { version = "0.14", default-features = false }
+opaque-debug = "0.3"
+ring = { version = "0.16", default-features = false }
+zeroize = { version = "1", default-features = false }
+
+# optional features
 aead = { version = "0.4", optional = true, default-features = false }
 digest = { version = "0.9", optional = true }
 ecdsa = { version = "0.13", optional = true, default-features = false }
 ed25519 = { version = "1.3", optional = true, default-features = false }
-generic-array = { version = "0.14", default-features = false }
-opaque-debug = "0.3"
 p256 = { version = "0.10", optional = true, default-features = false, features = ["ecdsa-core"] }
 p384 = { version = "0.9", optional = true, default-features = false, features = ["ecdsa"] }
-ring = { version = "0.16", default-features = false }
-zeroize = { version = "1", default-features = false }
 
 [dev-dependencies]
 hex-literal = "0.3"
diff --git a/src/lib.rs b/src/lib.rs
index 8c72c43..dbddc6d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,16 @@
-//! Compatibility crate for using [RustCrypto traits] with the cryptographic
-//! algorithm implementations from [*ring*].
+#![doc = include_str!("../README.md")]
+
+//! # Features
+//!
+//! Functionality in this crate is gated under the following features:
 //!
-//! [RustCrypto traits]: https://github.com/RustCrypto/traits
-//! [*ring*]: https://github.com/briansmith/ring
+//! - `aead`: Authenticated Encryption with Associated Data algorithms: AES-GCM, ChaCha20Poly1305
+//! - `digest`: Cryptographic Hash Functions: SHA-1, SHA-256, SHA-384, SHA-512, SHA-512/256
+//! - `signature`: Digital Signature Algorithms, gated under the following features:
+//!   - `ecdsa`: Elliptic Curve Digital Signature Algorithm
+//!   - `ed25519`: Edwards Digital Signature Algorithm instantiated over Curve25519
+//!   - `p256`: ECDSA/NIST P-256
+//!   - `p384`: ECDSA/NIST P-384
 
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_cfg))]