    # File lib/fog/aws/models/cdn/distribution_helper.rb, line 36
            def enable
              requires :identity
              reload if etag.nil? or caller_reference.nil?
              unless enabled?
                self.enabled = true
                response = put_distribution_config(identity, etag, attributes_to_options)
                etag = response.headers['ETag']
                merge_attributes(response.body)
              end
              true
            end