diff --git a/externs/closure-types.js b/externs/closure-types.js
index 7585042816..efcf89e2e3 100644
--- a/externs/closure-types.js
+++ b/externs/closure-types.js
@@ -580,7 +580,7 @@ Polymer_PropertyEffects.prototype.get = function(path, root){};
 */
 Polymer_PropertyEffects.prototype.set = function(path, value, root){};
 /**
-* @param {string} path Path to array.
+* @param {string | !Array<string|number>} path Path to array.
 * @param {...*} items 
 * @return {number}
 */
@@ -2720,4 +2720,4 @@ Polymer_ArraySelectorMixin._parseBindings = function(text, templateInfo){};
 Polymer_ArraySelectorMixin._evaluateBinding = function(inst, part, path, props, oldProps, hasPaths){};
 /**
 */
-Polymer_ArraySelectorMixin.finalize = function(){};
\ No newline at end of file
+Polymer_ArraySelectorMixin.finalize = function(){};
diff --git a/lib/mixins/property-effects.html b/lib/mixins/property-effects.html
index 41645bb6db..5761eb23b2 100644
--- a/lib/mixins/property-effects.html
+++ b/lib/mixins/property-effects.html
@@ -1809,7 +1809,7 @@
        * This method notifies other paths to the same array that a
        * splice occurred to the array.
        *
-       * @param {string} path Path to array.
+       * @param {string | !Array<string|number>} path Path to array.
        * @param {...*} items Items to push onto array
        * @return {number} New length of the array.
        * @public