China's central bank governors and former IMF officials say the inclusion is a landmark event for the yuan's internationalization and a confirmation of the yuan's credibility.

"The yuan's inclusion to the SDR will enhance the transparency of our monetary policy and the reliability of our money market data. So that the world can have a better understanding of Chinese economy," said Yi Gang, Vice Governor of People's Bank of China.

"After the inclusion, member nations can apply RMB-denominated loans from the IMF. They can use the yuan to pay the interests and make the repayments. They can also use RMB to buy quotas from the IMF. All these are feasible now with the inclusion," said Zhu Min, Fmr Deputy MD of IMF.

"The inclusion is an accreditation of RMB's credibility. RMB has become one of the major currencies," said Yi Gang.