It's in response to what seems to have been an aesthetic reaction to the poem that the printer of Paradise Lost asked Milton, went back to Milton and asked him to append a note to the book's second printing -- to append a note that explains why the poem rhymes not.

这是弥尔顿对《失乐园》的出版商的答复,出版商问弥尔顿关于此诗的美学问题，他找到弥尔顿，让他给此诗的第二次印刷附一个,注解--附个注解解释这诗为什么不押韵。

耶鲁公开课 - 弥尔顿课程节选