Declare use of `*` in README

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Wilson Lin 2018-07-06 22:59:01 +12:00
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@ -223,6 +223,9 @@ Tags not in one of the categories below are **specific tags**.
### Options
For options that have a list of tags as their values, the tags should be separated by a comma.
An `*` (asterisk, U+002A) can be used to represent the complete set of possible tags. It essentially fully enables or disables the option.
For brevity, hyperbuild has built-in sets of tags that can be used in place of declaring all their members; they begin with a `$` sign:
|Name|Tags|Source|