diff --git a/docs/extensions.md b/docs/extensions.md
index ad95454..5f0986a 100644
--- a/docs/extensions.md
+++ b/docs/extensions.md
@@ -6,6 +6,8 @@ AnyCable comes with useful Action Cable API extensions which you may use with an
 
 ### Broadcast to objects
 
+> See the [demo](https://github.com/anycable/anycable_rails_demo/pull/34) of using this feature.
+
 AnyCable allows to pass not only strings but arbitrary to `ActionCable.server.broadcast` to represent streams, for example:
 
 ```ruby
@@ -68,6 +70,8 @@ This feature is only supported when using AnyCable.
 
 ## Whispering
 
+> See the [demo](https://github.com/anycable/anycable_rails_demo/pull/34) of using whispering with Rails.
+
 AnyCable supports _whispering_, or client-initiated broadcasts. A typical use-case for whispering is sending typing notifications in messaging apps or sharing cursor positions. Here is an example client-side code leveraging whispers (using [AnyCable JS][anycable-client]):
 
 ```js
diff --git a/docs/getting_started.md b/docs/getting_started.md
index 27dd051..e95926e 100644
--- a/docs/getting_started.md
+++ b/docs/getting_started.md
@@ -184,8 +184,8 @@ To use `:test` Action Cable adapter along with AnyCable, you can extend it in th
 # config/environments/test.rb
 Rails.application.configure do
   config.after_initialize do
-    # Don't forget to configure URL
-    config.action_cable.url = ActionCable.server.config.url = ENV.fetch("CABLE_URL", "ws://localhost:8080/cable")
+    # Don't forget to configure URL in your anycable.yml or via ANYCABLE_WEBSOCKET_URL
+    config.action_cable.url = ActionCable.server.config.url = AnyCable.config.websocket_url
 
     # Make test adapter AnyCable-compatible
     AnyCable::Rails.extend_adapter!(ActionCable.server.pubsub)