diff --git a/src/Gateway.php b/src/Gateway.php
index 905130b..5fbbc61 100644
--- a/src/Gateway.php
+++ b/src/Gateway.php
@@ -114,6 +114,11 @@ public function capture($transaction, string $order = null, $amount = null)
         return $this->process($transaction);
     }
 
+    /**
+     * Create a new Vault instance.
+     *
+     * @return \CraigPaul\Moneris\Vault
+     */
     public function cards()
     {
         return new Vault($this->id, $this->token, $this->environment);