diff --git a/README.md b/README.md
index f1b3635..307032f 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ function MyApp({ Component, pageProps }) {
   useEffect(() => {
     init({ url: MATOMO_URL, siteId: MATOMO_SITE_ID });
   }, []);
-  
+
   return <Component {...pageProps} />;
 }
 
@@ -67,6 +67,16 @@ import { push } from "@socialgouv/matomo-next";
 push(["trackEvent", "contact", "click phone"]);
 ```
 
+### Extensibility
+
+The function has three optional callback properties that allow for custom behavior to be added:
+
+- `onRouteChangeStart(path: string) => void`: This callback is triggered when the route is about to change with Next Router event `routeChangeStart`. It receives the new path as a parameter.
+
+- `onRouteChangeComplete`: This callback is triggered when the route change is complete with Next Router event `routeChangeComplete`. It receives the new path as a parameter.
+
+- `onInitialization`: This callback is triggered when the function is first initialized. It does not receive any parameters. **It could be useful to use it if you want to add parameter to Matomo when the page is render the first time.**
+
 ## Tests
 
 ```
diff --git a/src/__tests__/matomo.test.ts b/src/__tests__/matomo.test.ts
index 0afbd22..1c11858 100644
--- a/src/__tests__/matomo.test.ts
+++ b/src/__tests__/matomo.test.ts
@@ -101,6 +101,21 @@ describe("push", () => {
   });
 });
 
+describe("onInitialization", () => {
+  test("should work if the surcharge of the operator", () => {
+    init({
+      onInitialization: () => {
+        push(["during_initialization", "hello"]);
+      },
+      siteId: "42",
+      url: "YO",
+    });
+    expect(window._paq).toEqual(
+      expect.arrayContaining([["during_initialization", "hello"]])
+    );
+  });
+});
+
 describe("router.routeChangeStart event", () => {
   beforeEach(() => {
     global._paq = [];
diff --git a/src/index.ts b/src/index.ts
index 6fd4e4f..8df0d7f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -18,6 +18,7 @@ interface InitSettings {
   excludeUrlsPatterns?: RegExp[];
   onRouteChangeStart?: (path: string) => void;
   onRouteChangeComplete?: (path: string) => void;
+  onInitialization?: () => void;
 }
 
 interface Dimensions {
@@ -65,6 +66,7 @@ export function init({
   excludeUrlsPatterns = [],
   onRouteChangeStart = undefined,
   onRouteChangeComplete = undefined,
+  onInitialization = undefined,
 }: InitSettings): void {
   window._paq = window._paq !== null ? window._paq : [];
   if (!url) {
@@ -89,6 +91,8 @@ export function init({
   push(["setTrackerUrl", `${url}/${phpTrackerFile}`]);
   push(["setSiteId", siteId]);
 
+  if (onInitialization) onInitialization();
+
   /**
    * for initial loading we use the location.pathname
    * as the first url visited.