From c6c715f465e345993fd456ce6e02f923a7530f0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Olivier=20Ch=C3=A9ron?= <olivier.cheron@gmail.com>
Date: Tue, 22 Aug 2017 20:39:29 +0200
Subject: [PATCH] Add note about Digest implementing ByteArrayAccess

---
 Crypto/Hash/Types.hs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Crypto/Hash/Types.hs b/Crypto/Hash/Types.hs
index 9f088a5..ee594a1 100644
--- a/Crypto/Hash/Types.hs
+++ b/Crypto/Hash/Types.hs
@@ -62,6 +62,14 @@ newtype Context a = Context Bytes
     deriving (ByteArrayAccess,NFData)
 
 -- | Represent a digest for a given hash algorithm.
+--
+-- This type is an instance of 'ByteArrayAccess' from package
+-- <https://hackage.haskell.org/package/memory memory>.
+-- Module "Data.ByteArray" provides many primitives to work with those values
+-- including conversion to other types.
+--
+-- Creating a digest from a bytearray is also possible with function
+-- 'Crypto.Hash.digestFromByteString'.
 newtype Digest a = Digest (F.UArray Word8)
     deriving (Eq,Ord,ByteArrayAccess)