From c9d8b197cad0565693d2a552eb278e4126e6eb18 Mon Sep 17 00:00:00 2001
From: Florian Gilcher <florian.gilcher@asquera.de>
Date: Thu, 22 Aug 2019 07:53:32 -0700
Subject: [PATCH] Add dependencies explanation to book

---
 docs/src/tutorial/specification.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/src/tutorial/specification.md b/docs/src/tutorial/specification.md
index 884a0657..ce2abcb4 100644
--- a/docs/src/tutorial/specification.md
+++ b/docs/src/tutorial/specification.md
@@ -45,3 +45,11 @@ $ rustup override add nightly
 $ rustc --version
 rustc 1.38.0-nightly (c4715198b 2019-08-05)
 ```
+
+Add the following lines to `Cargo.toml`:
+
+```toml
+[dependencies]
+futures-preview = { version = "0.3.0-alpha.18", features = [ "async-await", "nightly" ] }
+async-std = "0.99"
+```