diff --git a/guide/english/certifications/front-end-libraries/react/use-the-lifecycle-method-componentwillmount/index.md b/guide/english/certifications/front-end-libraries/react/use-the-lifecycle-method-componentwillmount/index.md
index b260882d1f..10a6fd2a36 100644
--- a/guide/english/certifications/front-end-libraries/react/use-the-lifecycle-method-componentwillmount/index.md
+++ b/guide/english/certifications/front-end-libraries/react/use-the-lifecycle-method-componentwillmount/index.md
@@ -23,3 +23,5 @@ componentWillMount() {
   console.log('Component being mounted');
 }
 ```
+
+##### Note: The ``` componentWillMount ``` Lifecycle method has been deprecated as of version 17, and does not work on later versions. [(Source)](https://reactjs.org/docs/react-component.html)