diff --git a/source/Ox/js/DOM.js b/source/Ox/js/DOM.js
index 3e9325d9..dd1284a0 100644
--- a/source/Ox/js/DOM.js
+++ b/source/Ox/js/DOM.js
@@ -165,7 +165,7 @@ Ox.$ = Ox.element = function $(value) {
             ([selector]) -> <[h]> Children
             selector <s|'*'> CSS selector
         @*/
-        children: function children() {
+        children: function children(selector) {
             var children = Ox.unique(Ox.flatten(elements.map(function(element) {
                 return Ox.slice(element.childNodes);
             })));
@@ -467,7 +467,7 @@ Ox.$ = Ox.element = function $(value) {
             ([selector]) -> <[h]> Ancestor elements
             selector <s|'*'> CSS selector
         @*/
-        parents: function parents() {
+        parents: function parents(selector) {
             var parents = [];
             Ox.reverse(elements).forEach(function(element) {
                 var parent = element;
@@ -642,7 +642,7 @@ Ox.$ = Ox.element = function $(value) {
             ([selector]) -> <[h]> Siblings
             selector <s|'*'> CSS selector
         @*/
-        siblings: function siblings() {
+        siblings: function siblings(selector) {
             var siblings = Ox.unique(elements.map(function(element) {
                 return Ox.filter(
                     element.parentNode.childNodes,