diff --git a/README.md b/README.md
index 30cfc67..641faac 100644
--- a/README.md
+++ b/README.md
@@ -3,13 +3,15 @@
 CircleCI is a useful service for previewing document builds. However,
 by default their artifact server behaves differently from a standard
 static pages server, in that it does not render `foo/bar` from
-`foo/bar/index.html`.
+`foo/bar/index.html`. They store files on S3, and certain URLs may
+also redirect, causing CORS issues.
 
 This CloudFlare Worker proxy fixes that, by fetching missing `foo/bar`
 pages from `foo/bar/index.html`. It also tries `foo/bar.html`, just in
 case (e.g., this is useful for static page builds in older versions of
 the `mystmd` document engine, which did not yet provide `index.html`
-pages).
+pages). It follows redirects, and returns the final result.
+
 
 ## Usage
 
@@ -22,8 +24,6 @@ Action](https://github.com/scientific-python/circleci-artifacts-redirector-actio
 to automatically provide that link in the status of your GH preview
 build.
 
-If you replace `output.circle-artifacts.com` with
-`circle.scientific-python.dev`, the requests will go through this
-proxy (see `worker.js`), and will render pages correctly, as described above.
-
-**TODO:** Update `circleci-artifact-redirector-action` to accept a different base domain.
+Using its `domain` option, replace `output.circle-artifacts.com` with
+`circle.scientific-python.dev` to send requests through this proxy,
+which will render routes correctly, as described above.