From 9ecdc4d30f5c8bd8363fc3704b5905d6faa70961 Mon Sep 17 00:00:00 2001
From: Daniel Lubarov <daniel@lubarov.com>
Date: Tue, 11 Jan 2022 19:36:32 -0800
Subject: [PATCH] note about toolchain

---
 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index 8f1f1cfc..d4bb04fd 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,17 @@ Plonky2 is built for speed, and features a highly efficient recursive circuit. O
 For more details about the Plonky2 argument system, see this [writeup](plonky2.pdf).
 
 
+## Building
+
+Plonky2 requires a recent nightly toolchain, although we plan to transition to stable in the future.
+
+To use a nightly toolchain for Plonky2 by default, you can run
+```
+rustup override set nightly
+```
+in the Plonky2 directory.
+
+
 ## Running
 
 To see recursion performance, one can run this test, which generates a chain of three recursion proofs: