diff --git a/README.md b/README.md
index fdfd021e2215f96b59f56415dc3ad6bedd4245ff..a7e539edba2a300a4763232128052193d7115450 100644
--- a/README.md
+++ b/README.md
@@ -51,10 +51,10 @@ The `csst_proto` uses an awesome algorithm based on `numpy.ndarray` indices to f
 
 | file / directory   | description                     | notes | C6  | C7  |
 |--------------------|---------------------------------|-------|-----|-----|
-| `csst_proto`       | source code & data              |       | √   |     |
-| `doc`              | sphinx-based documentation      |       |     | √   |
-| `example`          | code examples                   |       | -   | -   |
-| `tests`            | unit tests                      |       |     | √   |
+| `csst_proto/`      | source code & data              |       | √   |     |
+| `doc/`             | sphinx-based documentation      |       |     | √   |
+| `example/`         | code examples                   |       | -   | -   |
+| `tests/`           | unit tests                      |       |     | √   |
 | `.gitignore`       | git file                        |       | √   |     |
 | `.gitlab-ci.yml`   | gitlab CI/CD pipeline           |       |     | √   |
 | `LICENSE`          | code license                    |       | √   |     |