diff --git a/src/Qbirr.php b/src/Qbirr.php
index ae3aea8..6e86537 100644
--- a/src/Qbirr.php
+++ b/src/Qbirr.php
@@ -46,7 +46,7 @@ class Qbirr {
      * Verify a transaction.
      *
      * @param array $req {
-     *   provider:         cbe | telebirr | abyssinia | dashen | mpesa | awash | ebirr
+     *   provider:         cbe | telebirr | abyssinia | dashen | mpesa | awash | ebirr | zamzam
      *   ref:              Transaction ref. For awash, SMS URL or token. For ebirr, "tenant/token" or URL.
      *   amount:           Expected payment in ETB.
      *   receiver_name:    Your receiving account name.