diff --git a/5-Data-Science-In-Cloud/21-tbd/README.md b/5-Data-Science-In-Cloud/21-tbd/README.md
index 5695df95..1d45cbd4 100644
--- a/5-Data-Science-In-Cloud/21-tbd/README.md
+++ b/5-Data-Science-In-Cloud/21-tbd/README.md
@@ -1,10 +1,16 @@
-# Data Science in the Cloud: TBD
+# Data Science in the Cloud: in progress
+In this lesson, you will learn the fundamental principles of the Cloud, then you will see why it can be interesting for you to use Cloud services to run your data science projects and we'll look at some examples of data science projects run in the Cloud. 
+
 
 ## Pre-Lecture Quiz
 
 [Pre-lecture quiz]()
 
-## 🚀 Challenge
+## What is the Cloud?
+
+## Why Choose the Cloud for Data Science? 
+
+## Examples of Data Science in the Cloud 
 
 
 ## Post-Lecture Quiz