Handling MQTT discovery changes

I have a large number of sensors and switches hooked up to MQTT and I’m working on getting them auto-discovered by HA using the MQQT discovery mechanism. So far so good, but I noticed that if the “configure” message contents changes (say I changed the name of a sensor) the change is not picked-up by HA. It just logs “Component has already been discovered”. Is there an option somewhere to tell HA to update the component definition?