diff --git a/spec/system/admin/orders/invoices_spec.rb b/spec/system/admin/orders/invoices_spec.rb
index a7d452dfc645..8440ad83f41f 100644
--- a/spec/system/admin/orders/invoices_spec.rb
+++ b/spec/system/admin/orders/invoices_spec.rb
@@ -112,6 +112,7 @@
         expect(order.invoices.count).to eq 0
         page.find("#links-dropdown", text: "ACTIONS").click
         click_link "Print Invoice"
+        # wait for PDF to open in new window
         new_window = windows.last
         page.within_window new_window do
           expect(order.invoices.count).to eq 1