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Small note to describe Nil #1474

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2 changes: 2 additions & 0 deletions _tour/generic-classes.md
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,8 @@ class Stack[A] {
```
This implementation of a `Stack` class takes any type `A` as a parameter. This means the underlying list, `var elements: List[A] = Nil`, can only store elements of type `A`. The procedure `def push` only accepts objects of type `A` (note: `elements = x :: elements` reassigns `elements` to a new list created by prepending `x` to the current `elements`).

`Nil` here is an empty `List` and is not to be confused with `Null`.
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`Nil` here is an empty `List` and is not to be confused with `Null`.
`Nil` here is an empty `List` and is not to be confused with `null`.


## Usage

To use a generic class, put the type in the square brackets in place of `A`.
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