Are there any Dark Tower spoilers in 'On Writing'?

[Dabs]

I have read almost every single Stephen King book. I want to save The Dark Tower series for last, so I want to read On Writing, but since it is non-fiction and he talks about his work, I was wondering if there were any dark tower related spoilers in there. I have read every other book (except Danse Macabre which I am almost done with, and the DT comics too of course) so idc about any other spoilers, just dark tower. thanks!

[vivazebool]

Not one. Go ahead and read On Writing.