Update README.md

README.md

@@ -3,21 +3,23 @@ picotls
 
 [![Build Status](https://travis-ci.org/h2o/picotls.svg?branch=master)](https://travis-ci.org/h2o/picotls)
 
-Picotls is a [TLS 1.3](https://tlswg.github.io/tls13-spec/) implementation written in C.
-
-At the moment, the library implements draft-22 of the specification, including support 0-RTT resumption using PSK or PSK-DHE.
+Picotls is a [TLS 1.3 (RFC 8446)](https://tools.ietf.org/html/rfc8446) implementation written in C, with the following features:
+* support for two crypto engines
+  * "OpenSSL" backend using libcrypto for crypto and X.509 operations
+  * "minicrypto" backend using [cifra](https://github.com/ctz/cifra) for most crypto and [micro-ecc](https://github.com/kmackay/micro-ecc) for secp256r1
+* support for PSK, PSK-DHE resumption using 0-RTT
+* API for dealing directly with TLS handshake messages (essential for QUIC)
 
 Primary goal of the project is to create a fast, tiny TLS 1.3 implementation that can be used with the HTTP/2 protocol stack and possibly the upcoming QUIC stack of the [H2O HTTP/2 server](https://h2o.examp1e.net).
 
-Picotls only implements the communination protocol; cryptographic operations are delegated to cryptographic engines.
-At the moment, _minicrypto_ binding (uses [cifra](https://github.com/ctz/cifra/) and [micro-ecc](https://github.com/kmackay/micro-ecc)) and _openssl_ binding are provided.
+The TLS protocol ipmlementation of picotls is licensed under the MIT license.
 
-License and algorithms supported by the bindings are as follows:
+License and the cryptographic algorithms supported by the crypto bindings are as follows:
 
 | Binding | License | Key Exchange | Certificate | AEAD cipher |
 |:-----:|:-----:|:-----:|:-----:|:-----:|
-| minicrypto | [CC0](https://github.com/ctz/cifra/) / [2-clause BSD](https://github.com/kmackay/micro-ecc) | secp256r1, x25519 | ECDSA (P256)<sup>1</sup> | AES-128-GCM |
-| OpenSSL | OpenSSL | secp256r1 | RSA, ECDSA (P256) | AES-128-GCM |
+| minicrypto | [CC0](https://github.com/ctz/cifra/) / [2-clause BSD](https://github.com/kmackay/micro-ecc) | secp256r1, x25519 | ECDSA (P256)<sup>1</sup> | AES-128-GCM, chacha20-poly1305 |
+| OpenSSL | OpenSSL | secp256r1, secp384r1, secp521r1, x25519 | RSA, ECDSA (P256) | AES-128-GCM, chacha20-poly1305 |
 
 Note 1: Minicrypto binding is capable of signing a handshake using the certificate's key, but cannot verify a signature sent by the peer.