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[tlaplus] What's wrong with this temporal formula?

Hi again!

I have the following temporal formula:

y'= 0 \/ y ~0 -> y-1

Which I hope says that the next value of y is  zero or y-1 if y is not zero.

However, when I put this as a property in TLC, I get the error:

Was expecting ===== or more module body, encountered '~' in Properties at line 1 and token 'y'.

Obviously it's not happy with the ~ (equally unhappy with \lnot), but I'm not sure how to proceed from here!

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