diff --git a/src/utils/popper.js b/src/utils/popper.js
index f8b64db28..821555451 100644
--- a/src/utils/popper.js
+++ b/src/utils/popper.js
@@ -369,7 +369,8 @@
      * @method
      * @memberof Popper
      * @param config {HTMLElement} popper element
-     * @returns {HTMLElement} reference element
+     * @param reference {HTMLElement} reference element
+     * @returns {String} position
      */
     Popper.prototype._getPosition = function(popper, reference) {
         var container = getOffsetParent(reference);