From 6d7d96c6f6dfb2574ff72c85fd55d09ec7ac803d Mon Sep 17 00:00:00 2001
From: Calvin Combs <66279577+comcalvi@users.noreply.github.com>
Date: Tue, 8 Mar 2022 17:58:37 -0800
Subject: [PATCH] doc: added allowlist docs to CONTRIBUTING.md (#4048)

---
 CONTRIBUTING.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 331ac6fe3c..099da6c304 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -96,6 +96,18 @@ specific service, for example:
 AWS_REGION=[set region] node node_modules/cucumber/bin/cucumber.js --tag @s3
 ```
 
+Hardcoded region strings are not allowed in the SDK. To check the code for
+the presence of hardcoded region strings, run
+
+```
+node ./scripts/region-checker/index.js
+```
+
+from the project root directory. If this command shows any output, the PR will
+not be merged. Any lines that appear here must have the region string removed
+or be added to `scripts/region-checker/allowlist.js`. Lines should only be
+allowlisted if absolutely necessary.
+
 ### Testing the documentation changes:
 
 To test the documentation changes, please ensure you have the following requirements installed (Please make sure you have the latest version of Ruby):