From cd8df8f991589c1dec9abc71304ccde30d74264c Mon Sep 17 00:00:00 2001
From: JF Bastien <github@jfbastien.com>
Date: Wed, 2 Sep 2015 13:22:35 -0700
Subject: Lock-free guarantees

Addresses #300.
---
 Portability.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Portability.md b/Portability.md
index 19b8b30..711c37b 100644
--- a/Portability.md
+++ b/Portability.md
@@ -39,6 +39,9 @@ characteristics:
   processes executing on the same machine.
 * An execution environment which offers forward progress guarantees to all
   threads of execution (even when executing in a non-parallel manner).
+* Availability of lock-free atomic memory operations, when naturally aligned, for
+  8- 16- and 32-bit accesses. At a minimum this must include an atomic
+  compare-and-exchange operation (including load-linked/store-conditional).
 
 ## API
 
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