diff --git a/README.md b/README.md
index 635daafb4d..28637cfc72 100644
--- a/README.md
+++ b/README.md
@@ -347,7 +347,7 @@ function onInputKeyDown(event) {
 	Property	|	Type		|	Default		|	Description
 :-----------------------|:--------------|:--------------|:--------------------------------
 	addLabelText	|	string	|	'Add "{label}"?'	|	text to display when `allowCreate` is true
-  arrowRenderer | func | undefined | Renders a custom drop-down arrow to be shown in the right-hand side of the select: `arrowRenderer({ onMouseDown })`
+  arrowRenderer | func | undefined | Renders a custom drop-down arrow to be shown in the right-hand side of the select: `arrowRenderer({ onMouseDown, isOpen })`
 	autoBlur	|	bool | false | Blurs the input element after a selection has been made. Handy for lowering the keyboard on mobile devices
 	autofocus       |       bool    |      undefined        |  autofocus the component on mount
 	autoload 	|	bool	|	true		|	whether to auto-load the default async options set
diff --git a/src/Select.js b/src/Select.js
index ffd6b51daa..c9cb722b9c 100644
--- a/src/Select.js
+++ b/src/Select.js
@@ -910,7 +910,8 @@ const Select = React.createClass({
 
 	renderArrow () {
 		const onMouseDown = this.handleMouseDownOnArrow;
-		const arrow = this.props.arrowRenderer({ onMouseDown });
+                const isOpen = this.state.isOpen;
+		const arrow = this.props.arrowRenderer({ onMouseDown, isOpen });
 
 		return (
 			<span