bank & credit card statements

In the past when I have received paper statements, I have written notes on the statement to help me remember what each item was about.

Now I am being encouraged to receive PDF statements instead. I am not against the idea but I want to keep adding notes without printing from the PDF, which would defeat the object of saving paper.

Surely there must be a way of either adding notes to the PDF or having the option of adding editable blank page to the right for me to add some notes?

Any suggestions?