These proposals are subject to change as negotiations between the union and Apple continue, the union told Bloomberg.

While we await the outcome of negotiations, here’s what you should know about the proposal for tipping.

Is tipping even allowed at Apple stores?

Apple didn’t immediately respond to a request for comment.

What kind of tips are we talking about?

How many stores would this affect?

Apple has opposed unionization efforts in many of its stores.

Only two Apple stores are currently unionized, the Towson location and anOklahoma City store.

There are272 Apple storesin the US, and nearly as many overseas.

Apple opened its first retail storein Indiain April.

When might tipping go into effect?

It’s early days still in what could be a prolonged back-and-forth between the company and the union.

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