From e7920f4fe07191ff549786cc67e615efa66b37df Mon Sep 17 00:00:00 2001
From: Who? Me?! <mark-i-m@users.noreply.github.com>
Date: Sat, 4 Apr 2020 13:24:30 -0500
Subject: [PATCH] Update .gitignore

---
 src/doc/rustc-dev-guide/.gitignore | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/doc/rustc-dev-guide/.gitignore b/src/doc/rustc-dev-guide/.gitignore
index 7585238efedf..b8cb34883f58 100644
--- a/src/doc/rustc-dev-guide/.gitignore
+++ b/src/doc/rustc-dev-guide/.gitignore
@@ -1 +1,4 @@
 book
+
+# prevent accidentally changes
+book.toml