Security Deposit increase notice in CA for daycare in unit

[Lois S.]

My single older tenant notified us she is applying to get licensed to do daycare in her home/our SFH.

In Calif, we are permitted increase the SD to 2X rent because of the daycare.  (We can't legally deny her the right to operate it out of our property.)  I'm writing a notice of the increase.

Should I just create a notice without citing the reason, or list the reason as something like "anticipated wear & tear, etc.?

If anyone out there has dealt with this in CA, please chime in.

Thanks!