Fingerprint tree instructions for guests

I want to put instructions next to my fingerprint tree guest book at the wedding. I;m afraid people won't know what to do. I;m even thinking I might have a few bm or family members do it before I drop it off at the wedding so people will see how to do it. Any whooo......

What do you think about this 'saying' that I can put in a frame on the table?

Our Wedding Tree

Please “leaf” your fingerprint
and sign your name to
help us remember who shared
in celebrating our wedding day.

Love,
Kimberly and Erik