diff --git a/README.md b/README.md
index 7bdf69ccd9acaafe31365a3c21e9f87317e8e61b..fdfd021e2215f96b59f56415dc3ad6bedd4245ff 100644
--- a/README.md
+++ b/README.md
@@ -45,3 +45,23 @@ img_flipped = flip_image(img=img)
 ## algorithm description
 
 The `csst_proto` uses an awesome algorithm based on `numpy.ndarray` indices to flip images.
+
+
+## timeline
+
+| file / directory   | description                     | notes | C6  | C7  |
+|--------------------|---------------------------------|-------|-----|-----|
+| `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                    |       | √   |     |
+| `README.md`        | readme file                     |       | √   |     |
+| `install.sh`       | single-line installation script |       | √   |     |
+| `install_local.sh` | local installation script       |       | √   |     |
+| `readthedocs.yml`  | readthedocs.io configuration    |       |     | √   |
+| `requirements.txt` | code requirements               |       | √   |     |
+| `setup.py`         | sphinx-based documentation      |       | √   |     |
+
diff --git a/standards.md b/standards.md
deleted file mode 100644
index 8589d839a40a0d8c72151c921a02acaf78d1308a..0000000000000000000000000000000000000000
--- a/standards.md
+++ /dev/null
@@ -1,53 +0,0 @@
-## CSST L1 Pipeline Standards
-
-### Workplace
-
-Gitlab Group **CSST-L1**:
-https://csst-tb.bao.ac.cn/code/csst-l1
-
-### Prototype
-
-https://csst-tb.bao.ac.cn/code/csst-l1/csst_proto
-
-### Structure of files
-
-An example of the tree
-
-```bash
-csst_proto
- |-csst_proto
- |  |-data
- |  |  |-test_image.txt
- |  |  |-table_data.txt
- |  |-__init__.py
- |  |-flip_image.py
- |  |-some_other_modules.py
- |  |-top_level_interface.py
- |-tests
- |-doc (sphinx directory)
- |-setup.py
- |-LICENSE
- |-README.md
-```
-
-
-1. `setup.py`
-    this file 
-
-2.
-
-### Code style
-
-PEP8.
-
-### Documentation
-
-sphinx-based documentation needs docstrings.
-
-1. docstring styles
-    - Numpy (recommended)
-    - Google
-
-### Unit Tests
-
-