diff --git a/plugins/woocommerce/includes/class-wc-coupon.php b/plugins/woocommerce/includes/class-wc-coupon.php
index d8cf7a02410..5738f1d1603 100644
--- a/plugins/woocommerce/includes/class-wc-coupon.php
+++ b/plugins/woocommerce/includes/class-wc-coupon.php
@@ -136,7 +136,7 @@ class WC_Coupon extends WC_Legacy_Coupon {
 	/**
 	 * Checks the coupon type.
 	 *
-	 * @param  string $type Array or string of types.
+	 * @param  string|array $type Array or string of types.
 	 * @return bool
 	 */
 	public function is_type( $type ) {