| Index: README.md
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| diff --git a/README.md b/README.md
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| index 6035cb91cb14a44d78e3b774731154ededbbe9a9..30157a8ab16911cd7fd49cb2abe4558d443ae4b3 100644
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| --- a/README.md
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| +++ b/README.md
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| @@ -528,7 +528,9 @@ time before they time out.
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| Tests can be filtered based on their tags by passing command line flags. The
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| `--tags` or `-t` flag will cause the test runner to only run tests with the
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| given tags, and the `--exclude-tags` or `-x` flag will cause it to only run
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| -tests *without* the given tags.
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| +tests *without* the given tags. These flags also support
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| +[boolean selector syntax][]. For example, you can pass `--tags "(chrome ||
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| +firefox) && !slow"` to select quick Chrome or Firefox tests.
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| Note that tags must be valid Dart identifiers, although they may also contain
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| hyphens.
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