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 The test case consists of a description, an input text, and a syntax tree you expect. Each part is separated by the delimiter `---`. The syntax tree is represented by the syntax like an [S-expression](https://en.wikipedia.org/wiki/S-expression).
 
+A text of a token is represented by a string enclosed in `'` or `"`. Within `"..."`, characters can alose be represented by Unicode code points (for instance, `\u{000A}` is LF).
+
 Save the above test case to `test.txt` file and run the following command.
 
 ```sh