Cut measurements question

Submitted by tbkurtz on Sat, 08/03/2013 - 22:13

I'm making this desk: http://ana-white.com/2012/08/plans/55-fancy-x-desk

For the required cuts, what does it mean when there are two separate inch measurements... for example (2 – 2x4 @ 30 3/8” ¾”) or (4 – 2x4 @ 21” ¾”).

I know the 21 inch long 2x4s are supposed to be 21 inches long, so what does the 3/4 inch mean...

Thanks in advance...
-Tom