The Canadian AIDS Society (CAS) is pleased to provide a new resource, Peerology: A guide by and for people who use drugs on how to get involved. CAS adheres to the “Nothing about us, without us” principle and supports the inclusion of people who use drugs in the response to HIV/AIDS and hepatitis C. This document, written by and for people who use drugs, serves to guide those who wish to get involved locally and mobilize to improve the life conditions of people who use drugs in their area. It provides advice on how to include people who use drugs in decisions that affect their lives and tips to assist in building capacity to respond to the needs of people who use drugs.