Stolonctl pgParameters command usage problem

I am getting an error using pgParameters. Can you help me?

root@keeper1:/# stolonctl update --patch ‘{ “pgParameters” : {“max_connections” : “100”, “shared_buffers” : “384MB” } }’ --cluster-name=stolon-cluster --store-backend=etcdv3
ERROR : too many arguments

Can you try one setting at a time?