Permanent minions?

Minion-Maker description (p87) says that minions only last for the current scene. Then it says: 

"You may be able to have more permanent helpers based on story development; see pages 142-143 for details."

But pages 142-143 (Hero Advancement) say nothing about permanent helpers. 

Any suggestions?

The best I can come up with is to allow spending a collection to start a scene with a minion, for scenes where that makes sense (heroes at scene for a while before action starts).

It's actually on page 248 Alternate Rewards. Basically using your hero points for a Minion of size based on points spent - 2 points = d4, 3 = d6, 4 = d8, 5 = d10. Minion acts at the start of your turn as normal, and if it survives a scene, it can recover one die size automatically. If it gets knocked out, it's out for the session.