docs/read-only/README.md in flipper-0.21.0.rc1 vs docs/read-only/README.md in flipper-0.21.0.rc2

@@ -3,19 +3,22 @@
 A [read-only](https://github.com/jnunemaker/flipper/blob/master/lib/flipper/adapters/read_only.rb) adapter for [Flipper](https://github.com/jnunemaker/flipper).
 
 Use this adapter to wrap another adapter and raise an exception for any writes.
 
 Any attempted write raises `Flipper::Adapters::ReadOnly::WriteAttempted`  with message  `'write attempted while in read only mode'`
+
 ## Usage
+
 ```ruby
 # example wrapping memory adapter
 require 'flipper/adapters/read_only'
 
-memory_adapter = Flipper::Adapters::Memory.new
-read_only_adapter = Flipper::Adapters::ReadOnly.new(memory_adapter)
+Flipper.configure do |config|
+  config.adapter do
+    Flipper::Adapters::ReadOnly.new(Flipper::Adapters::Memory.new)
+  end
+end
 
-flipper = Flipper.new(read_only_adapter)
-
 # Enabling a feature
-> flipper[:dashboard_panel].enable
+> Flipper[:dashboard_panel].enable
 => Flipper::Adapters::ReadOnly::WriteAttempted: write attempted while in read only mode
 ```