Generally, you'll want to use document-system to start yourself off.
try running it like this:
CL-USER> (ql:quickload :coo) CL-USER> (coo:document-system :my-cool-system)
Exported symbols:
(SYSTEM &KEY KEEP-RST (BASE-PATH docs/))
Generate documentation for system in base-path.
If keep-rst is truthy, don't delete the intermediate restructured text file.