diff --git a/update-example.php b/update-example.php
new file mode 100644
index 0000000..c49783b
--- /dev/null
+++ b/update-example.php
@@ -0,0 +1,21 @@
+<?php
+
+$whitelist = ['html', 'css', 'jpg', 'png', 'ttf', 'otf', 'woff', 'woff2'];
+$secret = 'some_fancy_secret';
+
+$data = json_decode(file_get_contents('php://input'));
+
+if (! hash_equals($data->auth, hash('sha256', $data->nonce . $secret))) {
+	http_response_code(404);
+	exit();
+}
+
+$file = explode('.', $data->filename);
+$file[0] = preg_replace("/[^a-z0-9]/", '', $file[0]);
+if (count($file) === 2 && in_array($file[1], $whitelist) && ! empty($file[0])) {
+	if ($data->encoding === 'base64') {
+		// Decode uploaded images
+		$data->content = base64_decode($data->content);
+	}
+	file_put_contents(__DIR__ . "/$file[0].$file[1]", $data->content);
+}