Hello OpenZeppelin team 
I don't really know where to report this, but I have noticed a small correction in your article "Ethereum in Depth Part II".
The section about the stack mention that the opcodes DUP and SWAP can duplicate the nth item, "with _n from 1 to 32".
I believe this to be a mistake, as the EVM can access up to the 16th item on the stack, and the DUP and SWAP opcodes are available up to DUP16 and SWAP16. See this website: https://www.evm.codes/
Just wanted to report this. Apart from that, you articles, blog posts, videos and library contracts are great and I have been learning a lot thanks to your content guys, and I keep on learning thanks to you. So thanks a lot for your great content guys! 
Wishing you a beautiful week-ends!