Advice needed re:making contract changes

[Momof4]

I have the parents resign contracts annually. I've been doing this for just over 4 years and my contracts have had small changes some years and in the beginning lots of changes as I learned new lessons. I send out a letter a month ahead of the contract renewal date with the new contracts explaining the changes that I'm making every year.

Nobody has every questioned me because I always say something like: As I learn to improve my daycare program year by year I will be implementing the following changes this year as follows......