README.md in lipstick-1.0.0 vs README.md in lipstick-1.1.0

@@ -27,9 +27,11 @@
 
 ```
   bundle exec ruby -I lib:test test/test_lipstick.rb -v
 ```
 
+Manual cleanup may be required before re-running tests.
+
 ## Contributing to lipstick
  
 * Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
 * Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
 * Fork the project.