diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3db5024..dc50f78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,47 @@
-## [](https://github.com/nao1215/markdown/compare/v0.2.0...) (2024-05-05)
+## [](https://github.com/nao1215/markdown/compare/v0.4.0...) (2024-05-15)
+
+
+## [v0.4.0](https://github.com/nao1215/markdown/compare/v0.3.0...v0.4.0) (2024-05-06)
+
+* Introduce mermaid flowchart syntax [#24](https://github.com/nao1215/markdown/pull/24) ([nao1215](https://github.com/nao1215))
+
+## [v0.3.0](https://github.com/nao1215/markdown/compare/v0.2.0...v0.3.0) (2024-05-05)
 
 * Introduce mermaid entity relationship diagram [#23](https://github.com/nao1215/markdown/pull/23) ([nao1215](https://github.com/nao1215))
+
+## [v0.2.0](https://github.com/nao1215/markdown/compare/v0.1.0...v0.2.0) (2024-05-05)
+
+* Introduce pie chart (mermaid) [#22](https://github.com/nao1215/markdown/pull/22) ([nao1215](https://github.com/nao1215))
+
+## [v0.1.0](https://github.com/nao1215/markdown/compare/v0.0.8...v0.1.0) (2024-05-05)
+
+* Introduce mermaid sequence [#21](https://github.com/nao1215/markdown/pull/21) ([nao1215](https://github.com/nao1215))
+* Update project setting files [#20](https://github.com/nao1215/markdown/pull/20) ([nao1215](https://github.com/nao1215))
+* Introduce multi version unit test [#19](https://github.com/nao1215/markdown/pull/19) ([nao1215](https://github.com/nao1215))
+
+## [v0.0.8](https://github.com/nao1215/markdown/compare/v0.0.7...v0.0.8) (2024-03-29)
+
+* Change owner from go-spectest to nao1215 [#18](https://github.com/nao1215/markdown/pull/18) ([nao1215](https://github.com/nao1215))
+* Add SetAutoFormatHeaders to CustomTable [#17](https://github.com/nao1215/markdown/pull/17) ([Avihuc](https://github.com/Avihuc))
+* feat(15): Expose Custom table to have ability to change table behaviour [#16](https://github.com/nao1215/markdown/pull/16) ([varmakarthik12](https://github.com/varmakarthik12))
+
+## [v0.0.7](https://github.com/nao1215/markdown/compare/v0.0.6...v0.0.7) (2023-11-18)
+
+
+## [v0.0.6](https://github.com/nao1215/markdown/compare/v0.0.5...v0.0.6) (2023-11-04)
+
+
+## [v0.0.5](https://github.com/nao1215/markdown/compare/v0.0.4...v0.0.5) (2023-11-04)
+
+
+## [v0.0.4](https://github.com/nao1215/markdown/compare/v0.0.3...v0.0.4) (2023-11-04)
+
+
+## [v0.0.3](https://github.com/nao1215/markdown/compare/v0.0.2...v0.0.3) (2023-11-04)
+
+
+## [v0.0.2](https://github.com/nao1215/markdown/compare/v0.0.1...v0.0.2) (2023-10-26)
+
+
+## [v0.0.1](https://github.com/nao1215/markdown/compare/f79596a1a1e4...v0.0.1) (2023-10-22)
+
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..35dedec
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,11 @@
+## Contributing as a Developer
+- When creating a bug report: Please follow the template and provide detailed information.
+- When fixing a feature: Create a Pull Request (PR) with accompanying test code.
+- When adding a feature: First, propose the feature in an Issue.
+
+## Contributing Outside of Coding
+The following actions help boost my motivation:
+
+- Giving a GitHub Star
+- Promoting the application
+- Becoming a GitHub Sponsor
diff --git a/README.md b/README.md
index 036d730..dd62594 100644
--- a/README.md
+++ b/README.md
@@ -735,7 +735,7 @@ Next Description
 [MIT License](./LICENSE)
 
 ## Contribution
-First off, thanks for taking the time to contribute! Contributions are not only related to development. For example, GitHub Star motivates me to develop! Please feel free to contribute to this project.
+First off, thanks for taking the time to contribute! See [CONTRIBUTING.md](./CONTRIBUTING.md) for more information. Contributions are not only related to development. For example, GitHub Star motivates me to develop! Please feel free to contribute to this project.
 
 [![Star History Chart](https://api.star-history.com/svg?repos=nao1215/markdown&type=Date)](https://star-history.com/#nao1215/markdown&Date)