Comment by martinflack

If I'm understanding your question correctly, that's been in there from ANSI CL. For example, when defining a function, after the lambda list, a string will be interpreted as a docstring and stored with the function definition.

http://www.lispworks.com/documentation/HyperSpec/Body/f_docu...

    (defun test ()
      "A test function"
      (+ 1 1))
    => TEST

    (documentation 'test 'function)
    => "A test function"

You can statically analyze source code to pull them out, or ask the Lisp image for them, etc. Is there something missing?