From bf4946e713997838920957b605e7d5c403241fbb Mon Sep 17 00:00:00 2001
From: Steven Holtzen <sholtzen@gmail.com>
Date: Sat, 8 Aug 2020 10:01:40 -0700
Subject: [PATCH] readme update

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index bbba2f3..e19ffb7 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,9 @@ Then, install the following dependencies from `opam`:
 
 ```
 opam init   # must be performed before installing opam packages
+opam switch 4.09  # ocaml 4.09 is required
 eval `opam config env`     # optional: add this line to your .bashrc
+opam depext mlcuddidl
 opam install ounit core ppx_sexp_conv sexplib core_bench menhir ppx_deriving
 ```