diff --git a/README.md b/README.md
index 879fc70..2014903 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ ESLint plugin for [AWS CDK](https://github.com/aws/aws-cdk).
 
 ```bash
 # npm
-npm install -D eslint-cdk-plugin
+npm install --save-dev eslint-cdk-plugin
 
 # yarn
 yarn add -D eslint-cdk-plugin
diff --git a/docs/getting-started/index.md b/docs/getting-started/index.md
index cc78e99..560d9a5 100644
--- a/docs/getting-started/index.md
+++ b/docs/getting-started/index.md
@@ -12,7 +12,7 @@ Just run this:
 ::: code-group
 
 ```sh [npm]
-npm install -D eslint-cdk-plugin
+npm install --save-dev eslint-cdk-plugin
 ```
 
 ```sh [yarn]
diff --git a/docs/ja/getting-started/index.md b/docs/ja/getting-started/index.md
index 2e8e6d9..5213f67 100644
--- a/docs/ja/getting-started/index.md
+++ b/docs/ja/getting-started/index.md
@@ -12,7 +12,7 @@ titleTemplate: ":title"
 ::: code-group
 
 ```sh [npm]
-npm install -D eslint-cdk-plugin
+npm install --save-dev eslint-cdk-plugin
 ```
 
 ```sh [yarn]