diff --git a/README.md b/README.md
index 5c70415..f1e987f 100644
--- a/README.md
+++ b/README.md
@@ -28,9 +28,14 @@ This goal of this project is to help you get better at Angular and NgRx by resol
 <a href="./apps/context-outlet-type/README.md"><img src="https://img.shields.io/badge/4-ContextOutlet Typed-red" alt="Directive enhancement"/></a>
 <a href="./apps/crud/README.md"><img src="https://img.shields.io/badge/5-CRUD-green" alt="crud application"/></a>
 <a href="./apps/permissions/README.md"><img src="https://img.shields.io/badge/6-permissions-orange" alt="permissions"/></a>
-<a href="./apps/pipe-easy/README.md"><img src="https://img.shields.io/badge/6-simple pure pipe-green" alt="pipe easy"/></a>
-<a href="./apps/pipe-intermediate/README.md"><img src="https://img.shields.io/badge/6-wrapFn pipe-orange" alt="wrapFn pipe"/></a>
-<a href="./apps/pipe-hard/README.md"><img src="https://img.shields.io/badge/6-utilities pipe-red" alt="utilities pipe"/></a>
+<a href="./apps/pipe-easy/README.md"><img src="https://img.shields.io/badge/8-simple pure pipe-green" alt="pipe easy"/></a>
+<a href="./apps/pipe-intermediate/README.md"><img src="https://img.shields.io/badge/9-wrapFn pipe-orange" alt="wrapFn pipe"/></a>
+<a href="./apps/pipe-hard/README.md"><img src="https://img.shields.io/badge/10-utilities pipe-red" alt="utilities pipe"/></a>
+
+</br>
+<img src="https://img.shields.io/badge/RxJs--gray?logo=rxjs" alt="RxJs"/>
+
+<a href="./apps/rxjs-pipe-bug/README.md"><img src="https://img.shields.io/badge/11-BUG: chaining operators-orange" alt="Bug rxjs chaining operators"/></a>
 
 </br>
 <img src="https://img.shields.io/badge/NgRx--gray" alt="NgRx"/>
diff --git a/apps/rxjs-pipe-bug/README.md b/apps/rxjs-pipe-bug/README.md
index 4b02cdf..2a7e512 100644
--- a/apps/rxjs-pipe-bug/README.md
+++ b/apps/rxjs-pipe-bug/README.md
@@ -1,18 +1,26 @@
-<h1>Rxjs pipe bug</h1>
+<h1>BUG: RxJs chaining operators</h1>
 
 > Author: Thomas Laforge
 
-<!-- TODO: add Information/Statement/Rules/Constraint/Steps -->
+Let's dive inside the wonderful word of RxJs.
 
-### Information
+This challenge is inspired by a real-life example.
 
-### Statement
+### Presentation of the challenge
 
-### Step 1
+#### User Story
 
-### Step 2
+We need a button for each `Topic`. When we click on it, we delete all objects with this `Topic` in our database _(Fake DB in our case)_. Finally we display **All [topic] have been deleted** is everything was deleted successfully or **Error: deletion of some [topic] failed** if some deletions failed
 
-### Constraints:
+#### Constraints:
+
+We can only pass one object to our DB for deletion at the time. The DB will respond true if the data was successfully deleted and false otherwise.
+
+### What you need to do
+
+The QA team reports a **bug**. The UI shows **All [topic] have been deleted** all the time, even if some deletions fail.
+
+👉 Spot the bug and correct it.
 
 ### Submitting your work
 
@@ -24,8 +32,6 @@
 6. Commit your work
 7. Submit a PR with a title beginning with **Answer:11** that I will review and other dev can review.
 
-<!-- TODO: add challenge number and project Name -->
-
 <a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A11+label%3Aanswer"><img src="https://img.shields.io/badge/-Solutions-green" alt="Rxjs pipe bug"/></a>
 
 <!-- TODO: uncomment when done late -->