diff --git a/actionpack/lib/action_controller/metal/conditional_get.rb b/actionpack/lib/action_controller/metal/conditional_get.rb
index 967bda38f29bd6fb22add763aa883e3e046e4b7d..9a7e1b1ea21164c2c31f09da6255033b79b70225 100644
--- a/actionpack/lib/action_controller/metal/conditional_get.rb
+++ b/actionpack/lib/action_controller/metal/conditional_get.rb
@@ -25,7 +25,7 @@ module ClassMethods
       #     def show
       #       # Etag will differ even for the same invoice when it's viewed by a different current_user
       #       @invoice = Invoice.find(params[:id])
-      #       fresh_when(@invoice)
+      #       fresh_when etag: @invoice
       #     end
       #   end
       def etag(&etagger)