Why is there a need to tear off a corner of the folded filter paper before moistering it w/ water?

Question

Why is there a need to tear off a corner of the folded filter paper before moistering it w/ water?

Answer 1

It permits a better seal between the paper filter and the glass funnel. Here's a link that explains it a bit more:

http://icn2.umeche.maine.edu/genchemlabs...