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4 changes: 3 additions & 1 deletion content/docs/tags.md
Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,9 @@ This shows tasks that have the `HOME` tag, but do not have the `WORK` tag.
This is a very simple and easy to use mechanism, but it does require that your tasks are properly tagged.
In other words, it is based directly on task metadata.

A tag may be any single word that does not start with a digit, punctuation, or mathematical operator.
User-created tags can contain any glyphs, but cannot contain whitespace, and cannot start with a digit, or certain special characters such as math operators. See the `task(1)` man page under `+tag|-tag` for the full list of invalid starting characters.

Note that fully upper-case tags are reserved as *Virtual Tags* (see below).

## Complex Filters

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