diff --git a/lib/response.js b/lib/response.js
index e835d2fae..a3ec20112 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -235,7 +235,7 @@ module.exports = {
   /**
    * Vary on `field`.
    *
-   * @param {String} field
+   * @param {String|String[]} field
    * @api public
    */