From 4f6deedced0bc3b1e82770cf4334669e91850bc1 Mon Sep 17 00:00:00 2001
From: Daniel Norman <1992255+2color@users.noreply.github.com>
Date: Wed, 7 Feb 2024 14:27:13 +0100
Subject: [PATCH] docs: RAINBOW_SUBDOMAIN_GATEWAY_DOMAINS env var

---
 docs/environment-variables.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/environment-variables.md b/docs/environment-variables.md
index 19865ab..f07a415 100644
--- a/docs/environment-variables.md
+++ b/docs/environment-variables.md
@@ -79,6 +79,9 @@ tracing is disabled.
 
 Warning: Enabling tracing will likely affect performance.
 
+### `RAINBOW_SUBDOMAIN_GATEWAY_DOMAINS`
+
+Comma-separated list of subdomain gateway domains. For example, passing `dweb.link` will serve standard [subdomain gateway](https://specs.ipfs.tech/http-gateways/subdomain-gateway/) requests with the `Host` header set to`*.ipfs.dweb.link` and  `*.ipns.dweb.link`.
 
 ## Testing