Update readme to include S3 CORS config

README.md

@@ -24,15 +24,36 @@ Once we have the package installed we can make our uploader object, like so: (re
         "YOUR_S3_BUCKET",
         "eu-west-1"
     );
+
+More info on finding your region @ http://amzn.to/1FtPG6r
 
 Then, using the object we've just made, we can use it to generate the form's url and all the needed hidden inputs
 
     <form action="<?php echo $uploader->getFormUrl(); ?>" method="POST" enctype="multipart/form-data">
         <?php echo $uploader->getFormInputsAsHtml(); ?>
-        <!-- Other Inputs Go Here -->
+        <!-- Other inputs go here -->
+        <input type="file" name="file">
     </form>
 
-We have an [example project](https://github.com/eddturtle/direct-upload-s3-signaturev4) setup to demonstrate.
+### Example
+
+We have an [example project](https://github.com/eddturtle/direct-upload-s3-signaturev4) setup, along with the JavaScript, to demonstrate how the whole process will work.
+
+### S3 CORS Configuration
+
+When uploading a file to S3 it's important that the bucket has a CORS configuration that's open to accepting files from elsewhere. Here's an example CORS setup:
+
+    <?xml version="1.0" encoding="UTF-8"?>
+    <CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
+        <CORSRule>
+            <AllowedOrigin>*</AllowedOrigin>
+            <AllowedMethod>GET</AllowedMethod>
+            <AllowedMethod>POST</AllowedMethod>
+            <AllowedMethod>PUT</AllowedMethod>
+            <MaxAgeSeconds>3000</MaxAgeSeconds>
+            <AllowedHeader>*</AllowedHeader>
+        </CORSRule>
+    </CORSConfiguration>
 
 ### Contributing