Hi. Saw your comment. Trulia and most real estate sites like them, pull their info from your MLS and tax records. So you would want to correct it there. I went into the property (nice place!) and then clicked through to your broker website. I see you have it listed as 3 bath, 1 half bath. Strange....
Zillow allows owners to claim their home and change wrong information.
For your listing, if it doesn't update, I would suggest mentioning it in the comments.
Good luck selling!