def _validate_return_fields(self, return_fields):
for return_field in return_fields:<EOL><INDENT>if return_field not in self.RESPONSE_FIELD_MAP:<EOL><INDENT>raise InvalidReturnFieldException(<EOL>'<STR_LIT>'.format(return_field)<EOL>)<EOL><DEDENT><DEDENT>
:param return_fields: tuple
:raises: pybomb.exceptions.InvalidReturnFieldException