Got a letter from office of the assessor due to a recent remodel

[Jason Schlafke]

I recently purchased a property in CA and pulled a permit for a small remodeling project, and remodeling was done already. I just received a letter from Office of the assessor's office to ask me to provide cost breakdown for this remodeling project. It didn't cost a lot, only about 30k. Will that significantly increase the appraisal value and thus increase the property tax? 

What if I ignore that letter from assessor's office?