Core Functions in Depth - mention that lazy-seq is a macro

[devurandom]

In Core Functions in Depth, you introduce lazy-seq:

(defn even-numbers
  ([] (even-numbers 0))
  ([n] (cons n (lazy-seq (even-numbers (+ n 2))))))

It would help the understanding, if you mentioned, that it is a macro and thus does not follow regular evaluation semantics.