One of the causes of closure of a question as unclear on our site (I'm a mod at CrossValidated) is questions that make a series of statements but fail to actually ask anything -- they leave the actual question entirely implicit. It also seems to be at least sometimes an issue on other sites I frequent.
It would be very useful if the help/how-to-ask pages actually included the most basic aspect of asking a question -- which is to actually ask one.
Could something like this small addition be made?
Make sure you actually include your question. It may seem obvious to you what you mean to ask but it may not be so obvious to people reading your question -- it's better to be quite explicit about what you want to know.
It could perhaps go under "Be specific" for example.