Merge pull request #613 from tj-actions/chore/update-readme

chore: update readme

README.md

@@ -147,7 +147,7 @@ Support this project with a :star:
 |               quotepath                |       `boolean`        | `false`  |        `true`         |                                                                                                                                Output filenames completely verbatim by setting this to `false`                                                                                                                                |
 |             diff\_relative             |       `boolean`        | `false`  |                       |                                                                                                                       Exclude changes outside the current directory and show pathnames relative to it.                                                                                                                        |
 |               dir\_names               |       `boolean`        | `false`  |        `false`        |                                                                                        Output unique changed directories instead of filenames. <br> NOTE: This returns `.` for <br> changed files located in the root of the project.                                                                                         |
-|                  json                  |       `boolean`        | `false`  |        `false`        |                                                                                                                            Output changed files in JSON format which can be used for matrix jobs.                                                                                                                             |
+|                  json                  |       `boolean`        | `false`  |        `false`        |                                                                                                                            Output changed files in JSON format which can be used for [matrix jobs](https://github.com/tj-actions/changed-files/blob/main/.github/workflows/manual-matrix-test.yml).                                                                                                                             |
 |                  since                  |       `string`        | `false`  |                |                                                                                                                            Get changed files for commits whose timestamp is older than the given time.                                                                                                                             |
 |                  until                  |       `string`        | `false`  |                |                                                                                                                            Get changed files for commits whose timestamp is earlier than the given time.                                                                                                                             |