Help: what's amended notice for my H1B extension application?

Receipt Number: WAC0123456789
Application Type: I129 , PETITION FOR A NONIMMIGRANT WORKER

Current Status: We mailed you an amended notice.

On June 22, 2007, an amended notice on this case was mailed describing how we will process your case. Please follow any instructions on the notice. If you move before receiving our notice, call customer service. If this I129 PETITION FOR A NONIMMIGRANT WORKER is still pending, you will be notified by mail when a decision is made, or if the office needs something from you. If you move while this case is pending, call customer service. If this case is still pending, we process each kind of case in the order we receive them. You can use our processing dates to estimate when this case will be done. This case is at our CALIFORNIA SERVICE CENTER location. Follow the link below for current processing dates. You can also receive automatic e-mail updates as we process your case. Just follow the link below to register.