After the stupendous success of "3 Idiots", filmmaker Rajkumar Hirani has started work on yet another script but refuses to reveal any details.

"I am writing a script and hopefully next year I will start making my film, but it is too early to talk about it," he said.

So far Hirani has scripted box office blockbusters only -- his "Munnabhai series" raked in moolah at the box-office as did Aamir Khan-starrer "3 Idiots".