Mitered bag--help needed

Has anyone ever made this pattern

I just love the look of this bag…even though I have to line it…I usually only felt bags because I hate to line them.
…but I have one question…I don’t exactly understand what the last part of the finishing directions mean when they say to fold the gussett like a grocery bag…does it mean to make a pleat of sorts with the gussett?

Yes, that’s what it means. This will give it depth versus just a flat bag. Mary