This is copied straight from the Singapore AIP:
All arriving turbo-propeller and turbo-jet aircraft are to fly at not faster than indicated air speed 250knots when within 40NM from Singapore Changi Airport or when at or below 10,000ft, except all arriving aircraft into Singapore Changi Airport shall comply with the speed restrictions depicted on the transitions and RNAV STARs. Further speed reductions will be regulated by ATC as necessary.
http://www.caas.gov.sg/caasWeb/expor...nr1/ENR1.1.pdf
Paragraph 5.11.2
Just incase you need a reference.