add hook doc

[loongs-zhang]

// Describe your PR here; eg. Fixes #issueNo

Make sure that:

• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.93%. Comparing base (87ab737) to head (6851e69).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #381      +/-   ##
==========================================
- Coverage   75.01%   74.93%   -0.08%     
==========================================
  Files          72       72              
  Lines        5415     5415              
==========================================
- Hits         4062     4058       -4     
- Misses       1353     1357       +4     

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