```ruby
module Slimdown
  # Exception class for Slimdown errors.
  class Exception < StandardError
  end
end
```

Add note about a breaking change that should happen at some point
user
```ruby
module Slimdown
  # Exception class for Slimdown errors.
  # TODO: On a major SemVer change, migrate to PageNotFoundException.
  class Exception < StandardError
  end
end
```
assistant