Update README

README.md

@@ -196,6 +196,13 @@ There are some standardised test helpers in `RpiAuth::SpecHelpers` that can be u
 
 There is also a page at `/rpi_auth/test` that has log-in and sign-up buttons which can be navigated to as part of the test suite to avoid having to render pages, or navigate into the shadow roots.
 
+To user these helpers you should add this to your `spec/rails_helper.rb`, inside the `RSpec.configure do |config|` block.
+
+```ruby
+  config.include RpiAuth::SpecHelpers, type: :request
+  config.include RpiAuth::SpecHelpers, type: :system
+```
+
 ## Troubleshooting
 
 Diagnosing issues with OpenID Connect can be tricky, so here are some things to try.