From f9d758aa2662dbb83f81cbcaad296b8053ca5c9f Mon Sep 17 00:00:00 2001
From: timifasubaa <30888507+timifasubaa@users.noreply.github.com>
Date: Fri, 23 Mar 2018 15:31:47 -0700
Subject: [PATCH] add yarn lock info to contributing.md (#4679)

---
 CONTRIBUTING.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b337dad4d8c78..7f7ff50ae6c26 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -259,6 +259,10 @@ superset runserver -d -p 8081
 npm run dev
 ```
 
+#### Upgrading npm packages
+
+Should you add or upgrade a npm package, which involves changing `package.json`, you'll need to re-run `yarn install` and push the newly generated `yarn.lock` file so we get the reproducible build. More information at (https://yarnpkg.com/blog/2016/11/24/lockfiles-for-all/)
+
 ## Testing
 
 Before running python unit tests, please setup local testing environment: