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There is a tiny section on optional/supplementary channels and RHSM, but there have been customer questions about it. The 5.8 doc should pull in this kbase: How can I access Optional and Supplementary channels, and -devel packages using Certificate-based RHN?: https://access.redhat.com/kb/docs/DOC-58640#comment-36018
Expanded the section: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5-Beta/html/Deployment_Guide/entitlements-and-yum.html
Link: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Deployment_Guide/entitlements-and-yum.html
Verified in: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Deployment_Guide/entitlements-and-yum.html Red_Hat_Enterprise_Linux-Deployment_Guide-5-en-US-8-0