The SDR was created as a supplementary international reserve asset in the context of the Bretton Woods fixed exchange rate system. (imf.org)
In November, the International Monetary Fund (IMF) agreed to add the renminbi to its Special Drawing Rights (SDR), a type of international reserve asset. (nbr.com)
The IMF created the SDR as an international reserve asset in 1969, but it is only used by governments and international institutions. (alephblog.com)