From 1fc4de69ed024e18b88cb6f040021630599de2f7 Mon Sep 17 00:00:00 2001
From: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Date: Tue, 29 Sep 2020 03:56:57 -0400
Subject: [PATCH] Document new features of make fixup (#7434)

---
 CONTRIBUTING.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 857f351695..e06b759512 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -176,13 +176,14 @@ Follow these steps to start contributing:
    ```bash
    $ make quality
    ```
-
    You can do the automatic style corrections and code verifications that can't be automated in one go:
 
    ```bash
    $ make fixup
    ```
 
+   This target is also optimized to only work with files modified by the PR you're working on.
+
    If you're modifying documents under `docs/source`, make sure to validate that
    they can still be built. This check also runs in CI. To run a local check
    make sure you have installed the documentation builder requirements, by