From 10232026342159ec2ad335dbec26b0d37af47303 Mon Sep 17 00:00:00 2001
From: "Yingbo (Max) Wang" <maxwyb@gmail.com>
Date: Sun, 30 Sep 2018 14:30:12 -0700
Subject: [PATCH] Update instructions on using ./tools/format.py in README

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 6bb89a25ff..572b0f4818 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,12 @@ submodule. However, you need to install separately:
     # Format code.
     ./tools/format.py
 
+Before running `./tools/format.py`, make sure you have `yapf` installed for the
+current Python and `rustfmt` for Rust. They can be installed by:
+
+    pip install yapf
+    rustup component add rustfmt-preview
+
 Other useful commands:
 
     # Call ninja manually.