diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 44dc14ef3c..c0a04ea9f8 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -42,14 +42,15 @@ Unsure where to begin contributing to TOAST UI? You can start by looking through
 ### Development WorkFlow
 - Set up your development environment
 - Make change from a right branch
-- Be sure the code passes `npm run lint`, `npm run test`
+- Be sure the code passes `npm run lint:all`, `npm run test:types:all`, `npm run test:all`
 - Make a pull request
 
 ### Development environment
 - Prepare your machine node and it's packages installed.
 - Checkout our repository
-- Install dependencies by `npm install && bower install`
-- Start webpack-dev-server by `npm run serve`
+- Install dependencies by `npm install`
+- Build toastmark by `npm run build toastmark`
+- Start snowpack-dev-server by `npm run serve`
 
 ### Make changes
 #### Checkout a branch
@@ -61,7 +62,7 @@ Unsure where to begin contributing to TOAST UI? You can start by looking through
 Run `npm run eslint` and make sure all the tests pass.
 
 #### Test
-Run `npm run test` and verify all the tests pass.
+Run `npm run test:all` and verify all the tests pass.
 If you are adding new commands or features, they must include tests.
 If you are changing functionality, update the tests if you need to.
 
diff --git a/README.md b/README.md
index 66b42e8f3e..1bf4c743cf 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,7 @@ Fork `main` branch into your personal repository. Clone it to local computer. In
 ```sh
 $ git clone https://github.com/{your-personal-repo}/tui.editor.git
 $ npm install
+$ npm run build toastmark
 $ npm run test editor
 ```