diff --git a/1.Basics.md b/1.Basics.md
index 5b3b9aa..be1cec9 100644
--- a/1.Basics.md
+++ b/1.Basics.md
@@ -1,6 +1,6 @@
 # Basics 101
 
-## 👋 P5js Editor
+## 👋 p5js Editor
 
 <p align="center">
 <img src="https://git.le-club-des-sans-sujets.org/gauthiier/Revisiting-Concepts-Notations-Software-Art/media/branch/main/img/editor.p5js.png" alt="autopilot creativity" height="650"/>	
@@ -79,6 +79,12 @@ function mouseMoved() {
 // Reference: https://p5js.org/reference/
 ```
 
+## 🤔 What are (x,y) coordinates (in p5js)?
+
+<p align="center">
+<img src="https://gitlab.com/aesthetic-programming/book/-/raw/master/source/1-GettingStarted/ch1_11.png" height="200"/>	
+</p>
+
 ## Sketch: 1.2 Variables
 
 ```javascript