The Ontario Government enacted Rowan’s Law (Concussion Safety) in 2018.  The Act requires all sport organizations to have a Concussion Code of Conduct. The Ontario Hockey Federation's Concussion Code of Conduct requires participants to review the Ontario Government’s issued Concussion Awareness Resources on an annual basis. 
OHF Concussion Protocol - mandatory for all parents, players over age 18, coaches and officials to review.  This is a one-page document. 
These short pdf documents provide good information on concussion awareness. Please read the document appropriate to your child's age level