diff --git a/app/en/references/auth-providers/google/page.mdx b/app/en/references/auth-providers/google/page.mdx
index 6cb380bf6..d3033f106 100644
--- a/app/en/references/auth-providers/google/page.mdx
+++ b/app/en/references/auth-providers/google/page.mdx
@@ -99,6 +99,7 @@ Before showing how to configure your Google app credentials, let's go through th
   - `https://www.googleapis.com/auth/userinfo.email`
   - `https://www.googleapis.com/auth/userinfo.profile`
 - Add the redirect URL generated by Arcade (see below) to the Authorized redirect URIs list
+- Add `https://cloud.arcade.dev` to the Authorized JavaScript origins list. The Google Drive, Docs, Sheets, Slides, and Forms MCP servers ask users to grant file access through a Google Drive file picker that Arcade hosts on that origin. Without it, Google blocks the picker with `Error 401: invalid_client` (no registered origin). If you self-host Arcade, add the origin (scheme and host, no path) of your `coordinator.<arcade.hostname>` Helm value instead.
 - Copy the client ID and client secret to use below
 
 Next, add the Google app to Arcade.