Bollywood superstar Shah Rukh Khan has praised Indian Prime Minister Narendra Modi's decision to demonitise Rs 500 and Rs 1,000 currency notes to curb black money. He says it isn't politically motivated and is a great move.

The central government on late Tuesday night notified the changes.

"Farsighted. Extremely smart. And not politically motivated. Will bring such a positive change for Indian economy. Great move Narendra Modi," Shah Rukh tweeted on Wednesday night.

The "Fan" star, who has completed 25 years of his journey in Hindi filmdom, on Wednesday launched a biography on him by "Kuchh Meetha Ho Jaye" director Samar Khan.

SRK thanked Samar and said it was "special".

"Thank you Samar Khan. This is so special. The book is lovely and my little one is happy to see so many papas. 25 years of a life," SRK tweeted.