How did you alter forum paths on phpBB?

[Random American]

Hello.

I know that it is custom coding, not an extension, but do you have the code for the changing the forum paths from a random number after viewforum.php?f={forum number} to the forum's name? (ie /web-development/) If not, then its fine, but I like the changes you made as it makes everything a lot more human readable.

Thanks.