diff --git a/spec/interactors/pay_cart_spec.rb b/spec/interactors/pay_cart_spec.rb
index 440a162..5d19740 100644
--- a/spec/interactors/pay_cart_spec.rb
+++ b/spec/interactors/pay_cart_spec.rb
@@ -162,7 +162,8 @@
 
     context 'when things come in fast', :transactional do
       it 'shouldn\'t do things twice' do
-        # Always returning the same cart object shares it between threads
+        # Don't return the object in the cart variable, as this would share
+        # the same instance of the object between all threads
         allow(Cart).to receive(:find_by!).with(id: cart.id).and_call_original
         expect do
           threaded(3) do