Internal Comments for sessions

We use comments not just as a way of remembering what was done to our customer, but also as a description to the customer billing system.
This means that the customer sees all our comments.

It starts to be a bit cumbersome.

In order to change this problem we need additional functionality "Internal comments".

Then we could easily have separate documentation for the client and comments, just for our eyes.

Of course, the form of filling in a comentary, that is, the window on which comments are made, should contain two fields so that you can enter two comments one at a time.

Please add this feature.

Regards,
mLipok