diff --git a/modules/payment/commerce_payment.api.php b/modules/payment/commerce_payment.api.php
index 31532dc..0fb70d3 100644
--- a/modules/payment/commerce_payment.api.php
+++ b/modules/payment/commerce_payment.api.php
@@ -197,7 +197,7 @@ function CALLBACK_commerce_payment_method_settings_form($settings = NULL) {
  * @param $pane_values
  *   The current values of the pane.
  * @param $checkout_pane
- *   The checkout pane array.
+ *   The checkout pane array. The checkout pane will be NULL if the payment is being added through the administration form.
  * @param $order
  *   The order object.
  * @return