For the advanced student: this is a good comment for HN. Its signal/noise ratio is very high, given its context. There's nothing wrong with brevity.

It's true that one-word comments where the word is facepalm would nearly always deserve downvoting. Discernment is required!

Facepalm all by itself would deserve downvotes. It's the quotation marks that set this apart.

Exactly the kind of discernment we need.