Document glob spec.

docs/pages/repo/docs/reference/configuration.mdx

@@ -437,4 +437,34 @@ option, `turbo` can warn you about an invalid configuration.
 }
 ```
 
+## Glob specification for paths
+
+Turborepo's glob implementation is based on [wax](https://glob.guide/user-guide/syntax/). A few of the most common patterns you will need are in the table below:
+
+| Pattern             | Description                                                                        |
+| ------------------- | ---------------------------------------------------------------------------------- |
+| `*`                 | Match all files in the directory                                                   |
+| `**`                | Deeply match all files and sub-directories                                         |
+| `some-dir/`         | Match the `some-dir` directory **but not its contents**                            |
+| `some-dir*`         | Match files and directories that start with `some-dir`                             |
+| `*.js`              | Matches all `.js` files in the directory                                           |
+| `*.{js,ts,tsx,jsx}` | Matches all files that end with the provided extensions in the directory           |
+| `*.{js?x}`          | Matches all files with the `js` and `jsx` extensions in the directory              |
+| `!`                 | Negate the whole glob (automatically applies `/**` to the end of the defined glob) |
+
+Here are a few examples of how to use these patterns:
+
+| Pattern            | Description                                                                                       |
+| ------------------ | ------------------------------------------------------------------------------------------------- |
+| `dist/**`          | Match all files in the `dist` directory and all sub-directories                                   |
+| `dist/some-dir/**` | Match all files in the `dist/some-dir` directory and all sub-directories in the current directory |
+| `dist/`            | Match the `dist` directory **but not its contents**                                               |
+| `dist`             | Match the `dist` directory **but not its contents**                                               |
+| `dist*`            | Match files and directories that start with `dist`                                                |
+| `dist/*.js`        | Matches all `.js` files in the `dist` directory                                                   |
+| `dist/**/*.js`     | Matches all deeply nested `.js` files in the `dist` directory                                     |
+| `../scripts/**`    | Up one directory, match all files and sub-directories in the `scripts` directory                  |
+
+For more advanced globbing patterns, see the [wax glob guide](https://glob.guide/user-guide/syntax/).
+
 [1]: /repo/docs/core-concepts/monorepos/configuring-workspaces