Hi Maureen,
I just checked the PDF and yes, the Periwinkle floaters are included in your 335 thread warp. If you've checked your threading and everything is accounted for, just throw this one extra Periwinkle fella over the back of the loom while you are weaving.

Thanks, I counted but obviously did it wrong and it didn’t make sense that the gray threading would start with a periwinkle so thought I should check. Sometimes the PDFs specifically indicate the float as part of the warp sequence and sometimes don’t.