From bc773fbdce3112b3c370768db13824e401c1b692 Mon Sep 17 00:00:00 2001
From: Andrew Poelstra <apoelstra@wpsoftware.net>
Date: Tue, 24 Jul 2018 21:18:03 +0000
Subject: [PATCH] add comments for Sync/Send impl

---
 src/lib.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 187054f..c1234a0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -402,7 +402,9 @@ pub struct Secp256k1<C> {
     phantom: PhantomData<C>
 }
 
+// The underlying secp context does not contain any references to memory it does not own
 unsafe impl<C> Send for Secp256k1<C> {}
+// The API does not permit any mutation of `Secp256k1` objects except through `&mut` references
 unsafe impl<C> Sync for Secp256k1<C> {}
 
 impl<C> Clone for Secp256k1<C> {