diff --git a/samples/3d-model/index.ts b/samples/3d-model/index.ts
index bb74d889..0ceb71e4 100644
--- a/samples/3d-model/index.ts
+++ b/samples/3d-model/index.ts
@@ -7,6 +7,7 @@
 // @ts-nocheck
 // [START maps_3d_model]
 async function init() {
+    // Import the needed libraries.
     const { Map3DElement, Model3DElement } = await google.maps.importLibrary("maps3d");
 
     const map = new Map3DElement({