diff --git a/docs/test_compose.md b/docs/test_compose.md
index 2a9ba98..21dde81 100644
--- a/docs/test_compose.md
+++ b/docs/test_compose.md
@@ -150,6 +150,7 @@ services:
 | <a name="input_compose_command"></a>[compose_command](#input_compose_command)    | string  | true     |                        | The command to run within <br>the docker compose service.                                        |
 | <a name="input_compose_file"></a>[compose_file](#input_compose_file)             | string  | false    | `"docker-compose.yml"` | The docker compose file used <br>to run the test.                                                |
 | <a name="input_compose_service"></a>[compose_service](#input_compose_service)    | string  | true     |                        | The docker compose service to <br>run the test against.                                          |
+| <a name="input_coverage"></a>[coverage](#input_coverage)                         | boolean | false    | `false`                | Generate a coverage HTML report <br>(requires coverage.py installed).                            |
 | <a name="input_environment"></a>[environment](#input_environment)                | string  | false    | `"test"`               | The environment to use for <br>testing.                                                          |
 | <a name="input_extra_build_args"></a>[extra_build_args](#input_extra_build_args) | string  | false    |                        | Space separated list of build <br>args to use for the <br>image.                                 |
 | <a name="input_image_name"></a>[image_name](#input_image_name)                   | string  | true     |                        | The image root name, without <br>tag. E.g. 'ghcr.io/[dollar]{{ github.repository }}'             |