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Update FAQ.md #268

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Expand Up @@ -45,7 +45,7 @@ At some point in the future ChainRules may support these. Maybe.
Odds are if you write a rule that returns the wrong one everything will just work fine.
We provide both to allow for clearer writing of rules, and easier debugging.

`Zero()` represents the fact that if one perturbs (adds a small change to) the matching primal there will be no change in the behavour of the primal function.
`Zero()` represents the fact that if one perturbs (adds a small change to) the matching primal there will be no change in the behaviour of the primal function.
For example in `fst(x,y) = x`, then the derivative of `fst` with respect to `y` is `Zero()`.
`fst(10, 5) == 10` and if we add `0.1` to `5` we still get `fst(10, 5.1)=10`.

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