From 8968547981f823734c93537764d59c0732636b52 Mon Sep 17 00:00:00 2001
From: therealyingtong <yingtong@electriccoin.co>
Date: Thu, 6 Aug 2020 13:13:49 +0800
Subject: [PATCH] Document pub enum Rseed<Fs> with link to ZIP 212

---
 zcash_primitives/src/primitives.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/zcash_primitives/src/primitives.rs b/zcash_primitives/src/primitives.rs
index 4f635a867..1c81fc03b 100644
--- a/zcash_primitives/src/primitives.rs
+++ b/zcash_primitives/src/primitives.rs
@@ -223,6 +223,11 @@ impl<E: JubjubEngine> PaymentAddress<E> {
     }
 }
 
+/// Enum for note randomness before and after [ZIP 212](https://zips.z.cash/zip-0212).
+///
+/// Before ZIP 212, the note commitment trapdoor `rcm` must be a scalar value.
+/// After ZIP 212, the note randomness `rseed` is a 32-byte sequence, used to derive
+/// both the note commitment trapdoor `rcm` and the ephemeral private key `esk`.
 #[derive(Copy, Clone, Debug)]
 pub enum Rseed<Fs> {
     BeforeZip212(Fs),