Leading caddie Steve Williams says he hasn't joined a class action lawsuit by professional caddies against the PGA Tour but believes "there is a lot of merit in the case."

More than 80 caddies have filed suit against the PGA, complaining they are forced to wear bibs with corporate logos but receive none of the sponsorship revenue.

Williams, a New Zealander who has caddied for Tiger Woods and Adam Scott, said "top caddies have sponsorship and endorsement deals but you are limited to things like a hat and a sleeve. The most visibility is on a shirt but the bibs mean you can't exploit it."

Williams said caddies had to maximize earnings and "it's about time this came to the table."