diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d022b07fd..ce59c4356 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -143,6 +143,7 @@ Misskey uses Vue(v3) as its front-end framework.
 - Use TypeScript.
 - When creating a new component, please use the Composition API (with [setup sugar](https://v3.vuejs.org/api/sfc-script-setup.html) and [ref sugar](https://github.com/vuejs/rfcs/discussions/369)) instead of the Options API.
 	- Some of the existing components are implemented in the Options API, but it is an old implementation. Refactors that migrate those components to the Composition API are also welcome.
+	  You might be able to use this shell command to find components that have not yet been refactored: `find packages/client/src -name '*.vue' | xargs grep '<script' | grep -v 'setup'`
 
 ## Notes
 ### How to resolve conflictions occurred at yarn.lock?