Firstly, before introducing the link...
The article isn't exactly aimed at foreign students, but people fluent in the language. However, these are still really valuable tips. There is one important thing, make sure that you don't use the information to "slot" your students into a certain "learning level". Don't box them in. Instead, when wanting to improve the student's skills (in this case reading comprehension), first identify what they need to work on and then suggest an appropriate strategy to employ. Consider the variables, what content are they trying to tackle, and for what reason (test, report, etc)
One of the things I liked about the article is about how deep one should read. Useful for students that struggle to comprehend some vocabulary. Having a brief skim of the text can give you a lot more context.
Anyway, take a look at the article. I'm sure it'll give you a few strategies you can teach your students.