README.md in clearance-1.13.0 vs README.md in clearance-1.14.0

@@ -335,9 +335,23 @@
 
 ```ruby
 visit root_path(as: user)
 ```
 
+Additionally, if `User#to_param` is overridden, you can pass a block in
+order to override the default behavior:
+
+```ruby
+# config/environments/test.rb
+MyRailsApp::Application.configure do
+  # ...
+  config.middleware.use Clearance::BackDoor do |username|
+    Clearance.configuration.user_model.find_by(username: username)
+  end
+  # ...
+end
+```
+
 ### Ready Made Feature Specs
 
 If you're using RSpec, you can generate feature specs to help prevent
 regressions in Clearance's integration with your Rails app over time. These
 feature specs, will also require `factory_girl_rails`.