Update README.md

Author: ghiculescu

README.md

@@ -28,7 +28,7 @@ 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` is automatically attached to the `test:prepare` task. This is attached before test tasks run via rake (eg `bin/rake test:all` or `bin/rake test:controllers`).
 
 If you need a Tailwind file in your CI environment to run tests, the simplest way to do this is to run this command: