Update README.md

Co-authored-by: Mike Dalessio <mike.dalessio@gmail.com>

Author: ghiculescu

README.md

@@ -28,9 +28,9 @@ The `tailwindcss:build` is automatically attached to `assets:precompile`, so bef
 
 ### Building for testing
 
-The `tailwindcss:build` is automatically attached to the `test:prepare` task. This is attached before Rails tests (eg `test:all` or `test:controllers`).
+The `tailwindcss:build` task is automatically attached to the `test:prepare` task. The `test:prepare` task is run before some test tasks (e.g. `test:all` and `test:controllers`), but not before the bare `test` task.
 
-If you need a Tailwind file in your CI environment to run tests, the simplest way to do this is to run this command:
+If your tests need Tailwind assets in your CI environment, it's best to be explicit and run this command:
 
 ```
 bin/rails test:prepare test