diff --git a/lib/utils.js b/lib/utils.js
index ab22f61e96..56e12b9b54 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -280,6 +280,7 @@ function createETagGenerator (options) {
 /**
  * Parse an extended query string with qs.
  *
+ * @param {String} str
  * @return {Object}
  * @private
  */