where is the preload adjust?

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hey, i have a 2006 GT avalanche 2.0 with the RST OMEGA T6 forks. im actually getting them replaced/repaired under warranty and have been looking at getting an upgrade when i noticed that all the spec sheets state that these forks have a pre load adjust.

Off the GT web site:
"RST Omega T6, hydraulic fork, magnesium lowers, preload adjust, 80-120 mm travel with lock out and travel adjust"

now the top of the forks have the lock out and the travel adjust and there isnt any adjustment at the bottom where rebound adjusters usually are. So does anyone know whats goin on here?
i have even tried looking for the fork on the RST web site and couldnt find it there, seems as though they have every other RST fork except these.