However, as policy rates approached the zero lower bound, central banks eased policy by additional means. For example, some central banks, including the Federal Reserve, sought to reduce longer-term interest rates by communicating that policy rates were likely to remain low for some time.
A prominent example of the use of central bank communication to further ease policy was the Bank of Canada’s conditional  BIS Review 156/2010  1  commitment to keep rates near zero until the end of the second quarter of 2010.