Update README.md

Author: sanjaymandadi

README.md

@@ -17,9 +17,10 @@ $tenantResource = new TenantResource();<br>
 $tenant = $tenantResource->getTenant([tenantId]);<br>
 <br>
 <B>Get Products</B><br>
-$apiContext = new ApiContext($tenant);
-$productResource = new ProductResource($apiContext);
-$productCollection = $this->object->getProducts(DataViewMode::LIVE, 0, 200, null, null, null, null, null);
+$apiContext = new ApiContext($tenant);<br>
+<B>Note:</B> You might need to create an API Context with a specific Mastercatalog or catalogId if you own a multi-catalog tenant<br>
+$productResource = new ProductResource($apiContext);<br>
+$productCollection = $productResource->getProducts(DataViewMode::LIVE, 0, 200, null, null, null, null, null);<br>
 <br>
 <B>Get Orders - Filter by date</B><br>
 $orderResource = new OrderResource($apiContext);<br>