From c89e4a5ad6d37cf4eab9cb47ac9629e05f9fa772 Mon Sep 17 00:00:00 2001
From: Jon Stelly <967068+jonstelly@users.noreply.github.com>
Date: Fri, 20 Aug 2021 21:54:11 -0500
Subject: [PATCH] docs(contributing): add black tool requirement for autogen.sh
 (#434)

Without black being installed, I get the error: black is not installed
---
 CONTRIBUTING.md | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6a8922fd..ec5d7d5d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,9 +30,9 @@ ffmpeg -i my_big_image.jpg -vf scale=w=256:h=256:force_original_aspect_ratio=dec
 
 Then just run the `./autogen.sh` to generate the added or updated node classes. (cf. [DEVELOPMENT][DEVELOPMENT.md])
 
-> IMPORTANT NOTE: To run `autogen.sh`, you need [round][round] and
+> IMPORTANT NOTE: To run `autogen.sh`, you need [round][round], [black][black] and
 > [inkscape][inkscape] command lines that are used for cleaning the image
-> resource filenames.
+> resource filenames and formatting the generated python code.
 >
 > macOS users can download the inkscape via Homebrew.
 >
@@ -40,6 +40,7 @@ Then just run the `./autogen.sh` to generate the added or updated node classes.
 
 [DEVELOPMENT.md]: ./DEVELOPMENT.md
 [round]: https://github.com/mingrammer/round
+[black]: https://pypi.org/project/black
 [inkscape]: https://inkscape.org/ko/release
 
 ### Update Aliases