Update build-a-k-nearest-neighbor-model-with-p5js.mdx

Author: sonnynomnom

projects/build-a-k-nearest-neighbor-model-with-p5js/build-a-k-nearest-neighbor-model-with-p5js.mdx

@@ -38,7 +38,7 @@ tags:
 **Versions:** None  
 **Read Time:** 45 minutes  
 
-## Machine Learning Models and KNN
+## Introduction
 
 Machine Learning might sound complex, but many of the core ideas aren't actually too tricky! One of the most common ML models is **K-Nearest Neighbors** (KNN).
 
@@ -68,7 +68,21 @@ Now, we’ll create a new character at the position of your mouse. Should they b
 
 As you move your mouse around, it’s like you’re designing hundreds of new characters and watching KNN decide their team instantly. See how our mouse pointer flips between drawing a red circle and green circle based on the 3 nearest points?
 
+## KNN
 
+Before we get started coding, let's learn about KNN real quick.
+
+KNN is a simple machine learning algorithm that:
+
+1. Looks at the `K` closest data points (neighbors) to a new data point.
+2. Uses those neighbors to predict what group the new data point belongs to.
+
+That's why it's called K-Nearest Neighbors:
+
+- If `K` is 3, we are looking at 3 closest neighbors. 
+- If `K` is 5, we are looking at 5 closest neighbors.
+
+Easy to remember, right?
 
 ### Step 1: Creating the Points Class