diff --git a/1-js/03-code-quality/05-testing-mocha/article.md b/1-js/03-code-quality/05-testing-mocha/article.md
index 4c2b1aa5e3..495d05d5dd 100644
--- a/1-js/03-code-quality/05-testing-mocha/article.md
+++ b/1-js/03-code-quality/05-testing-mocha/article.md
@@ -2,6 +2,12 @@
 
 Automated testing will be used in further tasks, and it's also widely used in real projects.
 
+```warn header="Advanced topic"
+Writing tests requires a good understanding of JavaScript.
+
+If you are a beginner, you're not required to write tests as of now, but you should know how the procedure works.
+```
+
 ## Why do we need tests?
 
 When we write a function, we can usually imagine what it should do: which parameters give which results.