Update README with note about yarn install

rails · Apr 1, 2020 · 579fd77 · 579fd77
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diff --git a/README.md b/README.md
@@ -106,6 +106,12 @@ Optional: To fix ["unmet peer dependency" warnings](https://github.com/rails/web
 yarn upgrade
 ```
 
+When `package.json` and/or `yarn.lock` changes, such as when pulling down changes to your local environemnt in a team settings, be sure to keep your NPM packages up-to-date:
+
+```bash
+yarn install
+```
+
 ### Usage
 
 Once installed, you can start writing modern ES6-flavored JavaScript apps right away: