old_contents: """Custom exceptions for `cltk` library."""
  
  class UnknownLanguageError(Exception):
      """Exception for when a user requests an NLP method that is not
      supported.
      """
  
new_contents: """Custom exceptions for `cltk` library."""
  
  class UnknownLanguageError(Exception):
      """Exception for when a user requests an NLP method that is not
      supported.
  
      TODO: Make a `CLTKException(Exception)` and have this inherit from that.
      """
  
subject: add exception note