Jinn are a creation of Allah who can travel anywhere they like in an instant; anywhere on Earth and anywhere in the Universe (with the exceptions mentioned by the Prophet pbuh). Yet when the Quran was being revealed, they were unable to leave Earth due to the huge presence of Angels.
Since they are also multilingual, they were able to understand when they were passing by and heard the Quran. They were even able to recognise it as similar to the book of Moses (AS).
They rushed to warn other Jinn, telling them that a book was being revealed which confirmed previous revelations. The Jinn recognise the Quran as divine revelation, what about us? Are we rushing to warn others that the Quran is true?