diff --git a/guides/source/active_storage_overview.md b/guides/source/active_storage_overview.md
index ec61daf2d0e..a0f7144f937 100644
--- a/guides/source/active_storage_overview.md
+++ b/guides/source/active_storage_overview.md
@@ -645,15 +645,17 @@ You should also make sure that the generated URLs use the CDN host instead of yo
 ```ruby
 # config/routes.rb
 direct :cdn_image do |model, options|
+  expires_in = options.delete(:expires_in) { ActiveStorage.urls_expire_in }
+
   if model.respond_to?(:signed_id)
     route_for(
       :rails_service_blob_proxy,
-      model.signed_id,
+      model.signed_id(expires_in: expires_in),
       model.filename,
       options.merge(host: ENV['CDN_HOST'])
     )
   else
-    signed_blob_id = model.blob.signed_id
+    signed_blob_id = model.blob.signed_id(expires_in: expires_in)
     variation_key  = model.variation.key
     filename       = model.blob.filename