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reference: 3 of the 4 things mentioned here are optional #28617

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Sep 24, 2015
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reference: 3 of the 4 things mentioned here are optional #28617

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7 changes: 4 additions & 3 deletions src/doc/reference.md
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Expand Up @@ -900,9 +900,10 @@ fn main() {}

### Functions

A _function item_ defines a sequence of [statements](#statements) and an
optional final [expression](#expressions), along with a name and a set of
parameters. Functions are declared with the keyword `fn`. Functions declare a
A _function item_ defines a sequence of [statements](#statements) and a
final [expression](#expressions), along with a name and a set of
parameters. Other than a name, all these are optional.
Functions are declared with the keyword `fn`. Functions may declare a
set of *input* [*variables*](#variables) as parameters, through which the caller
passes arguments into the function, and the *output* [*type*](#types)
of the value the function will return to its caller on completion.
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