diff --git a/src/lib.rs b/src/lib.rs
index cd3942f..67a80ca 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,128 @@
+//! # "It's not that hard" OAuth 2.0
+//!
+//! OAuth 2.0 really isn't that hard, you know?
+//!
+//! Implementation of [RFC 6749](http://tools.ietf.org/html/rfc6749).
+//!
+//! `inth_oauth2` is on [Crates.io][crate] and [GitHub][github].
+//!
+//! [crate]: https://crates.io/crates/inth-oauth2
+//! [github]: https://github.com/programble/inth-oauth2
+//!
+//! ## Providers
+//!
+//! Support for the following OAuth 2.0 providers is included:
+//!
+//! - Google
+//! - GitHub
+//! - Imgur
+//!
+//! Support for other providers can be added by implementing the `Provider` trait.
+//!
+//! ## Token types
+//!
+//! The only supported token type is Bearer. Support for others can be added by implementing the
+//! `Token` trait.
+//!
+//! ## Examples
+//!
+//! ### Creating a client
+//!
+//! ```
+//! use inth_oauth2::Client;
+//! use inth_oauth2::provider::Google;
+//!
+//! let client = Client::<Google>::new(
+//!     Default::default(),
+//!     "client_id",
+//!     "client_secret",
+//!     Some("redirect_uri")
+//! );
+//! ```
+//!
+//! ### Constructing an authorization URI
+//!
+//! ```
+//! # use inth_oauth2::Client;
+//! # use inth_oauth2::provider::Google;
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//! let auth_uri = client.auth_uri(Some("scope"), Some("state")).unwrap();
+//! println!("Authorize the application by clicking on the link: {}", auth_uri);
+//! ```
+//!
+//! ### Requesting an access token
+//!
+//! ```no_run
+//! use std::io;
+//! use inth_oauth2::{Client, Token};
+//! # use inth_oauth2::provider::Google;
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//!
+//! let mut code = String::new();
+//! io::stdin().read_line(&mut code).unwrap();
+//!
+//! let token = client.request_token(code.trim()).unwrap();
+//! println!("{}", token.access_token());
+//! ```
+//!
+//! ### Refreshing an access token
+//!
+//! ```no_run
+//! # use inth_oauth2::Client;
+//! # use inth_oauth2::provider::Google;
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//! # let token = client.request_token("").unwrap();
+//! let token = client.refresh_token(token, None).unwrap();
+//! ```
+//!
+//! ### Ensuring an access token is still valid
+//!
+//! ```no_run
+//! # use inth_oauth2::Client;
+//! # use inth_oauth2::provider::Google;
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//! # let mut token = client.request_token("").unwrap();
+//! // Refresh token only if it has expired.
+//! token = client.ensure_token(token).unwrap();
+//! ```
+//!
+//! ### Using bearer access tokens
+//!
+//! Bearer tokens can be converted to Hyper headers.
+//!
+//! ```no_run
+//! # extern crate hyper;
+//! # extern crate inth_oauth2;
+//! # use inth_oauth2::Client;
+//! # use inth_oauth2::provider::Google;
+//! use hyper::header::Authorization;
+//!
+//! # fn main() {
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//! # let token = client.request_token("").unwrap();
+//! let client = hyper::Client::new();
+//! let request = client.get("https://example.com/resource")
+//!     .header(Into::<Authorization<_>>::into(&token));
+//! # }
+//! ```
+//!
+//! ### Persisting tokens
+//!
+//! All token types implement `Encodable` and `Decodable` from `rustc_serialize`.
+//!
+//! ```no_run
+//! # extern crate inth_oauth2;
+//! # extern crate rustc_serialize;
+//! # use inth_oauth2::Client;
+//! # use inth_oauth2::provider::Google;
+//! use rustc_serialize::json;
+//! # fn main() {
+//! # let client = Client::<Google>::new(Default::default(), "", "", None);
+//! # let token = client.request_token("").unwrap();
+//! let json = json::encode(&token).unwrap();
+//! # }
+//! ```
+
 #![warn(
     missing_docs,
     missing_debug_implementations,