diff --git a/README.md b/README.md
index 95a3385..a2db226 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,21 @@
 # js-reinitializer
 
-A library for tracking and reinitializing \<link\> and \<script\> elements so that the browser downloads them. 
+A library for tracking and reinitializing `<link>` and `<script>` elements so that the browser downloads them. 
 
-Used when developing any dynamic requests via JS where links to third-party documents are supplied along with HTML content.
\ No newline at end of file
+Used when developing any dynamic requests via JS where links to third-party documents are supplied along with HTML content.
+
+# Instruction
+By default, the library is observe the first `<main>` element, but you can reassign it by passing an argument of type `{HTMLElement|null}` to `new e.detail.reinitializer();`
+
+
+    document.addEventListener('reinitializer.initialized', function (e) {
+        // Initialized reinitializer
+
+	    // Initialize of instance of reinitializer
+	    const reinitializer = new e.detail.reinitializer();
+
+	    // Start observation
+	    reinitializer.start();
+    });
+
+By default, after reinitialization, `<link>` elements are moved to the end of the `<head>` element, and `<script>` elements are moved to the end of the `<body>` element. You can override this behavior by changing the `reinitializer.js` and `reinitializer.css` properties.
\ No newline at end of file
