diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2848dd3f..9105e246 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+v2.2.0 - Wed, 28 Jun 2017 18:55:23 UTC
+--------------------------------------
+
+- [6f73764](../../commit/6f73764) [chore] update installation documentation.
+
+
 v2.0.7 - Sun, 25 Jun 2017 17:44:29 UTC
 --------------------------------------
 
diff --git a/bower.json b/bower.json
index 95ce832b..f2d5a21d 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "homepage": "https://github.com/reactjs/react-modal",
   "authors": [
     "Ryan Florence",
diff --git a/dist/react-modal.js b/dist/react-modal.js
index 615a955d..2ab9c7b6 100644
--- a/dist/react-modal.js
+++ b/dist/react-modal.js
@@ -254,6 +254,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	  ariaHideApp: _propTypes2.default.bool,
 	  shouldCloseOnOverlayClick: _propTypes2.default.bool,
 	  parentSelector: _propTypes2.default.func,
+	  aria: _propTypes2.default.object,
 	  role: _propTypes2.default.string,
 	  contentLabel: _propTypes2.default.string.isRequired
 	};
@@ -1384,6 +1385,13 @@ return /******/ (function(modules) { // webpackBootstrap
 	      return typeof additional === 'string' && additional ? className + ' ' + additional : className;
 	    };
 
+	    _this.ariaAttributes = function (items) {
+	      return Object.keys(items).reduce(function (acc, name) {
+	        acc['aria-' + name] = items[name];
+	        return acc;
+	      }, {});
+	    };
+
 	    _this.state = {
 	      afterOpen: false,
 	      beforeClose: false
@@ -1490,7 +1498,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	          onClick: this.handleOverlayOnClick },
 	        _react2.default.createElement(
 	          'div',
-	          {
+	          _extends({
 	            ref: this.setContentRef,
 	            style: _extends({}, contentStyles, this.props.style.content),
 	            className: this.buildClassName('content', className),
@@ -1498,7 +1506,8 @@ return /******/ (function(modules) { // webpackBootstrap
 	            onKeyDown: this.handleKeyDown,
 	            onClick: this.handleContentOnClick,
 	            role: this.props.role,
-	            'aria-label': this.props.contentLabel },
+	            'aria-label': this.props.contentLabel
+	          }, this.ariaAttributes(this.props.aria || {})),
 	          this.props.children
 	        )
 	      );
@@ -1535,6 +1544,7 @@ return /******/ (function(modules) { // webpackBootstrap
 	  shouldCloseOnOverlayClick: _propTypes.PropTypes.bool,
 	  role: _propTypes.PropTypes.string,
 	  contentLabel: _propTypes.PropTypes.string,
+	  aria: _propTypes.PropTypes.object,
 	  children: _propTypes.PropTypes.node
 	};
 	exports.default = ModalPortal;
diff --git a/dist/react-modal.min.js b/dist/react-modal.min.js
index 4ea38801..b084dc64 100644
--- a/dist/react-modal.min.js
+++ b/dist/react-modal.min.js
@@ -1,4 +1,4 @@
-!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t(require("react"),require("react-dom")):"function"==typeof define&&define.amd?define(["react","react-dom"],t):"object"==typeof exports?exports.ReactModal=t(require("react"),require("react-dom")):e.ReactModal=t(e.React,e.ReactDOM)}(this,function(e,t){return function(e){function t(o){if(n[o])return n[o].exports;var r=n[o]={exports:{},id:o,loaded:!1};return e[o].call(r.exports,r,r.exports,t),r.loaded=!0,r.exports}var n={};return t.m=e,t.c=n,t.p="/",t(0)}([function(e,t,n){"use strict";function o(e){return e&&e.__esModule?e:{default:e}}Object.defineProperty(t,"__esModule",{value:!0});var r=n(1),a=o(r);t.default=a.default},function(e,t,n){"use strict";function o(e){if(e&&e.__esModule)return e;var t={};if(null!=e)for(var n in e)Object.prototype.hasOwnProperty.call(e,n)&&(t[n]=e[n]);return t.default=e,t}function r(e){return e&&e.__esModule?e:{default:e}}function a(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function i(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function s(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}function u(e){return e()}Object.defineProperty(t,"__esModule",{value:!0}),t.bodyOpenClassName=t.portalClassName=void 0;var l=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var o in n)Object.prototype.hasOwnProperty.call(n,o)&&(e[o]=n[o])}return e},c=function(){function e(e,t){for(var n=0;n<t.length;n++){var o=t[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(e,o.key,o)}}return function(t,n,o){return n&&e(t.prototype,n),o&&e(t,o),t}}(),f=n(2),p=r(f),d=n(3),y=r(d),v=n(4),m=r(v),h=n(12),b=r(h),O=n(17),w=o(O),C=n(19),g=r(C),T=t.portalClassName="ReactModalPortal",P=t.bodyOpenClassName="ReactModal__Body--open",_=y.default.unstable_renderSubtreeIntoContainer,j=function(e){function t(){var e,n,o,r;a(this,t);for(var s=arguments.length,c=Array(s),f=0;f<s;f++)c[f]=arguments[f];return n=o=i(this,(e=t.__proto__||Object.getPrototypeOf(t)).call.apply(e,[this].concat(c))),o.removePortal=function(){y.default.unmountComponentAtNode(o.node);var e=u(o.props.parentSelector);e.removeChild(o.node)},o.renderPortal=function(e){o.portal=_(o,p.default.createElement(b.default,l({defaultStyles:t.defaultStyles},e)),o.node)},r=n,i(o,r)}return s(t,e),c(t,[{key:"componentDidMount",value:function(){this.node=document.createElement("div"),this.node.className=this.props.portalClassName;var e=u(this.props.parentSelector);e.appendChild(this.node),this.renderPortal(this.props)}},{key:"componentWillReceiveProps",value:function(e){var t=e.isOpen;if(this.props.isOpen||t){var n=u(this.props.parentSelector),o=u(e.parentSelector);o!==n&&(n.removeChild(this.node),o.appendChild(this.node)),this.renderPortal(e)}}},{key:"componentWillUpdate",value:function(e){e.portalClassName!==this.props.portalClassName&&(this.node.className=e.portalClassName)}},{key:"componentWillUnmount",value:function(){var e=this;if(this.node){var t=this.portal.state,n=Date.now(),o=t.isOpen&&this.props.closeTimeoutMS&&(t.closesAt||n+this.props.closeTimeoutMS);o?(t.beforeClose||this.portal.closeWithTimeout(),setTimeout(function(){return e.removePortal},o-n)):this.removePortal()}}},{key:"render",value:function(){return null}}],[{key:"setAppElement",value:function(e){w.setElement(e)}},{key:"injectCSS",value:function(){console.warn("React-Modal: injectCSS has been deprecated and no longer has any effect. It will be removed in a later version")}}]),t}(f.Component);j.propTypes={isOpen:m.default.bool.isRequired,style:m.default.shape({content:m.default.object,overlay:m.default.object}),portalClassName:m.default.string,bodyOpenClassName:m.default.string,className:m.default.oneOfType([m.default.string,m.default.object]),overlayClassName:m.default.oneOfType([m.default.string,m.default.object]),appElement:m.default.instanceOf(g.default),onAfterOpen:m.default.func,onRequestClose:m.default.func,closeTimeoutMS:m.default.number,ariaHideApp:m.default.bool,shouldCloseOnOverlayClick:m.default.bool,parentSelector:m.default.func,role:m.default.string,contentLabel:m.default.string.isRequired},j.defaultProps={isOpen:!1,portalClassName:T,bodyOpenClassName:P,ariaHideApp:!0,closeTimeoutMS:0,shouldCloseOnOverlayClick:!0,parentSelector:function(){return document.body}},j.defaultStyles={overlay:{position:"fixed",top:0,left:0,right:0,bottom:0,backgroundColor:"rgba(255, 255, 255, 0.75)"},content:{position:"absolute",top:"40px",left:"40px",right:"40px",bottom:"40px",border:"1px solid #ccc",background:"#fff",overflow:"auto",WebkitOverflowScrolling:"touch",borderRadius:"4px",outline:"none",padding:"20px"}},t.default=j},function(t,n){t.exports=e},function(e,n){e.exports=t},function(e,t,n){var o="function"==typeof Symbol&&Symbol.for&&Symbol.for("react.element")||60103,r=function(e){return"object"==typeof e&&null!==e&&e.$$typeof===o},a=!0;e.exports=n(5)(r,a)},function(e,t,n){"use strict";var o=n(6),r=n(7),a=n(8),i=n(9),s=n(10);e.exports=function(e,t){function n(e){var t=e&&(E&&e[E]||e[S]);if("function"==typeof t)return t}function u(e,t){return e===t?0!==e||1/e===1/t:e!==e&&t!==t}function l(e){this.message=e,this.stack=""}function c(e){function n(n,u,c,f,p,d,y){if(f=f||R,d=d||c,y!==i)if(t)r(!1,"Calling PropTypes validators directly is not supported by the `prop-types` package. 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diff --git a/package.json b/package.json
index 13236abb..54948d4a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-modal",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "description": "Accessible modal dialog component for React.JS",
   "main": "./lib/index.js",
   "repository": {