docs: add more details about automatic validation and formatting (#472)

diff --git a/.github/contributing.md b/.github/contributing.md
index 3d2733ad0f17ec66eba61c73299d1ebf9f692acd..bd51bcb9bdcc26c975b75e662db2be5d6dde1a7b 100644 (file)
--- a/.github/contributing.md
+++ b/.github/contributing.md
@@ -31,9 +31,9 @@ Hi! I'm really excited that you are interested in contributing to Vue.js. Before
 
 - Make sure tests pass!
 
-- Commit messages must follow the [commit message convention](./commit-convention.md) so that changelogs can be automatically generated. Commit messages are automatically validated before commit.
+- Commit messages must follow the [commit message convention](./commit-convention.md) so that changelogs can be automatically generated. Commit messages are automatically validated before commit (by invoking [Git Hooks](https://git-scm.com/docs/githooks) via [yorkie](https://github.com/yyx990803/yorkie)).
 
-- No need to worry about code style as long as you have installed the dev dependencies - modified files are automatically formatted with Prettier on commit.
+- No need to worry about code style as long as you have installed the dev dependencies - modified files are automatically formatted with Prettier on commit (by invoking [Git Hooks](https://git-scm.com/docs/githooks) via [yorkie](https://github.com/yyx990803/yorkie)).
 
 ## Development Setup