Concise points: how to offer extra information

A friend of mine made a site which lists pointers for teachers at regular schools who have one or more deaf children in their class. These are clear, concise, one-sentence "Do's" with regard to teaching a deaf child.

How could extra info be added to some of these points without cluttering, without breaking the clarity and brevity?

With extra info i mean a short paragraph of extra explanation, maybe some links. Not all the points would need this, but i think some points could do with a more in-depth explanation, examples or links to further reading.