diff --git a/README.md b/README.md
index c6978534..385c2190 100644
--- a/README.md
+++ b/README.md
@@ -1203,6 +1203,10 @@ class Square extends Shape {
   setLength(length) {
     this.length = length;
   }
+  
+  getArea() {
+    return this.length * this.length;
+  }
 }
 
 function renderLargeShapes(shapes) {
@@ -1221,7 +1225,7 @@ function renderLargeShapes(shapes) {
 }
 
 let shapes = [new Rectangle(), new Rectangle(), new Square()];
-renderLargeShapes();
+renderLargeShapes(shapes);
 ```
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