Arguably the best resource to start with for ADHD is with a simple Fact Sheet that can be provided to parents. Though this condition is commonly talked about by parents, media, teachers, etc., there are often misconceptions and/or misunderstandings that can easily be provided.
One such fact sheet is available from the Center for Disease control at:
This resource is also available in Spanish:
For a web-based or longer fact-sheet, a few other options exist: