Bank of Japan officials are looking at ways to enable bond yields to move around more as they try to improve the functioning of a bond market dominated by the central bank, according to people familiar with the matter.

With a review of policy looming next week, some of the officials want to generate more fluctuations in yields while sticking with the current movement range of around 20 basis points either side of the BOJ’s zero target on 10-year government debt, the people said.

That’s an indication officials see tweaks as aimed at encouraging more moves rather than allowing yields to go higher.