Tax Deadline Extension for Flood Victims in CA.?

So, I live in one of the counties in CA that qualify for the tax deadline extension this year of May 15 due to the floods that took place. I see there is a code (140) to enter for CA. when filing to determine this, but is there something that needs to be done for Federal filing so the IRS knows it would be after the April 18 normal deadline and not penalize me?