diff --git a/app/lib/definitions.ts b/app/lib/definitions.ts
index 17063fe..70eacd2 100644
--- a/app/lib/definitions.ts
+++ b/app/lib/definitions.ts
@@ -1,3 +1,5 @@
+/* Copyright (C) 2024 Manuel Bustillo*/
+
 // This file contains type definitions for your data.
 // It describes the shape of the data, and what data type each property should accept.
 // For simplicity of teaching, we're manually defining these types.
diff --git a/app/lib/placeholder-data.ts b/app/lib/placeholder-data.ts
index 76892d5..2d78faa 100644
--- a/app/lib/placeholder-data.ts
+++ b/app/lib/placeholder-data.ts
@@ -1,3 +1,5 @@
+/* Copyright (C) 2024 Manuel Bustillo*/
+
 // This file contains placeholder data that you'll be replacing with real data in the Data Fetching chapter:
 // https://nextjs.org/learn/dashboard-app/fetching-data
 const users = [
diff --git a/app/lib/utils.ts b/app/lib/utils.ts
index 8c1a35a..4d9ce77 100644
--- a/app/lib/utils.ts
+++ b/app/lib/utils.ts
@@ -1,3 +1,5 @@
+/* Copyright (C) 2024 Manuel Bustillo*/
+
 import { Revenue } from './definitions';
 
 export const formatCurrency = (amount: number) => {
diff --git a/app/seed/route.ts b/app/seed/route.ts
index 944672c..db632cd 100644
--- a/app/seed/route.ts
+++ b/app/seed/route.ts
@@ -1,3 +1,5 @@
+/* Copyright (C) 2024 Manuel Bustillo*/
+
 // import bcrypt from 'bcrypt';
 // import { db } from '@vercel/postgres';
 // import { guests, customers, revenue, users } from '../lib/placeholder-data';
diff --git a/app/ui/fonts.ts b/app/ui/fonts.ts
index 3299f09..e520f6f 100644
--- a/app/ui/fonts.ts
+++ b/app/ui/fonts.ts
@@ -1,3 +1,5 @@
+/* Copyright (C) 2024 Manuel Bustillo*/
+
 import { Inter, Lusitana, Gloria_Hallelujah} from 'next/font/google';
  
 export const inter = Inter({ subsets: ['latin'] });