Update index.mdx

link to google docs

Author: kathayl

src/content/docs/google-tag-gateway/index.mdx

@@ -6,7 +6,7 @@ sidebar:
 
 ---
 
-Google tag gateway for advertisers allows website owners using Cloudflare as a CDN to get the most out of ad measurement tools with just a few clicks.
+Google tag gateway for advertisers allows website owners using Cloudflare as a CDN to get the most out of ad measurement tools with just a few clicks. It allows you to deploy Google scripts using your own domain, enhancing data privacy and improving signal measurement recovery. Unlike standard setups where tags are requested from a Google domain, Google tag gateway for advertisers loads the tag from your domain and sends measurement events to your domain, where they are forwarded to Google.
 
 Learn more about why we built it and how it works in our [blog post](https://blog.cloudflare.com/google-tag-gateway-for-advertisers/).
 
@@ -38,3 +38,6 @@ The [Google tag ID](https://support.google.com/analytics/answer/9539598?hl=en) c
 6. Once you click **Save**, Google tag gateway for advertisers will be enabled on your zone. If you already have a GTM script on your website, this First Party Tag will override the existing script.
 
 Now that you have authenticated into your Cloudflare account and configured GTM in first-party mode, your Google Tags will be loaded using `https://your-domain/measurement-path/...`and subsequent measurement requests will be served by Cloudflare.
+
+## Related resource
+- [Google Developer Docs: Set up Google tag gateway for advertisers](https://developers.google.com/tag-platform/tag-manager/gateway/setup-guide?setup=auto)