Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['No.', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. Viewers (in millions)']

### Response:
SELECT Written by FROM table WHERE U.S. Viewers (in millions) = 2.09