diff --git a/commerce_invoice_receipt.module b/commerce_invoice_receipt.module
index 310a489..09ee283 100644
--- a/commerce_invoice_receipt.module
+++ b/commerce_invoice_receipt.module
@@ -259,6 +259,9 @@ function _commerce_invoice_receipt_get_invoice_info($order, $build) {
   if (isset($build['commerce_order'][$order->order_id]['commerce_order_total'])) {
     $info['order_total'] = $build['commerce_order'][$order->order_id]['commerce_order_total'][0]['#markup'];
   }
-  
+
+  // Allow other modules to add data to the info array.
+  drupal_alter('commerce_invoice_receipt_invoice_info', $info, $order);
+
   return $info;
 }