```ruby
class GirFFI::Builders::NullConvertor
  def initialize argument_name
    @argument_name = argument_name
  end

  def conversion
    @argument_name
  end
end
```

Add descriptive comment to NullConvertor
user
```ruby
# Argument convertor that does nothing
class GirFFI::Builders::NullConvertor
  def initialize argument_name
    @argument_name = argument_name
  end

  def conversion
    @argument_name
  end
end
```
assistant