diff --git a/src/PanelGroup.js b/src/PanelGroup.js
index <HASH>..<HASH> 100644
--- a/src/PanelGroup.js
+++ b/src/PanelGroup.js
@@ -1,3 +1,5 @@
+/* eslint react/prop-types: [1, {ignore: ["children", "className", "bsStyle"]}]*/
+/* BootstrapMixin contains `bsStyle` type validation */
 import React, { cloneElement } from 'react';
 import classNames from 'classnames';
 
@@ -9,6 +11,7 @@ const PanelGroup = React.createClass({
 
   propTypes: {
     collapsable: React.PropTypes.bool,
+    accordion: React.PropTypes.bool,
     activeKey: React.PropTypes.any,
     defaultActiveKey: React.PropTypes.any,
     onSelect: React.PropTypes.func
Define type for `accordion` property

in PanelGroup.js and disable superfluous warning for `bsStyle`.
BootstrapMixin contains type validation for it.