Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25084227_1 ( written_by VARCHAR, us_viewers__in_millions_ VARCHAR )

### Question ###
if the 2.09 million US viewers watched this episode, who was it written by

### Accurate SQL ###

SELECT written_by FROM table_25084227_1 WHERE us_viewers__in_millions_ = "2.09"