Seattle real estate startup Zillow today updated its initial public offering prospectus, adding sales information from May to the document that it filed last month.

Apparently it saw a 10 percent increase in traffic last month and it's adding the better numbers to investor pitch.

Here are the high-level stats in today's filing:

Consumers increasingly are turning to the Internet and mobile devices for real estate information. During May 2011, 22.0 million unique users visited our website and mobile applications, representing year-over-year growth of 102%. We operate the most popular mobile real estate applications across iPhone, iPad, Android and BlackBerry. During May 2011, Zillow was used on a mobile device more than 8.8 million times, with more than 1.7 million homes viewed on mobile devices each day.

For comparison, here are the stats in the May 23 filing:

Consumers increasingly are turning to the Internet and mobile devices for real estate information. During April 2011, 20.2 million unique users visited our
website and mobile applications, representing year-over-year growth of over 89%. We operate the most popular mobile real estate applications across iPhone,
iPad, Android and BlackBerry. During April 2011, Zillow was used on a mobile device more than 8.5 million times, with more than 1.7 million homes viewed on
mobile devices each day.