Accessing Connection Managers in Execute SQL Task

Hello all, I'm pretty new to SSIS and have a question.  I'm reading data from a Flat File Connection Manager into an OLE DB.  After the data has been processed, I have an Execute SQL task in which I want to set a column equal to the file name of the Flat File Connection Manager.  How would I go about doing this?  I'm not sure how I can reference it directly or through variables.  The SQL query looks like this:

UPDATE Table
SET Column = '<FileName goes here>'

Thanks.