Meant to add the 'your' as a way to generalize the statement. It's fine if English is not his first language, that's why you have others proof read before publishing. If there wasn't much effort to edit, I tend to presume there wasn't much effort put into it more generally.

I don't normally play this game. Today, I'll make an exception. It is one word, "proofread."

Glass houses, and all that sort of stuff.

Muphry's Law: https://en.m.wikipedia.org/wiki/Muphry's_law