diff --git a/lib/sse.js b/lib/sse.js
index b992b4f..c855f2b 100644
--- a/lib/sse.js
+++ b/lib/sse.js
@@ -1,6 +1,21 @@
 /**
+ * sse.js - A flexible EventSource polyfill/replacement.
+ * https://github.com/mpetazzoni/sse.js
+ *
  * Copyright (C) 2016-2024 Maxime Petazzoni <maxime.petazzoni@bulix.org>.
  * All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 
diff --git a/lib/sse.test.js b/lib/sse.test.js
index 5d382e5..7479175 100644
--- a/lib/sse.test.js
+++ b/lib/sse.test.js
@@ -1,3 +1,23 @@
+/**
+ * sse.js - A flexible EventSource polyfill/replacement.
+ * https://github.com/mpetazzoni/sse.js
+ *
+ * Copyright (C) 2016-2024 Maxime Petazzoni <maxime.petazzoni@bulix.org>.
+ * All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 import { SSE } from 'sse.js';
 
 // Setup Mocking for XMLHttpRequest
@@ -32,7 +52,7 @@ beforeEach(() => {
 
 
 describe('SSE Initialization', () => {
-  
+
   it('should initialize with default options', () => {
     const sse = new SSE('http://example.com');
     expect(sse.method).toBe('GET');
@@ -164,7 +184,7 @@ describe('SSE Event handling and Listeners', () => {
     expect(listener.mock.calls[0][0].event).toBe(undefined);
     expect(listener.mock.calls[0][0].id).toBe('1');
     expect(listener.mock.calls[0][0].lastEventId).toBe('1');
-  })  
+  })
 
   it('should handle multiple data events', () => {
     sse.xhr.responseText = 'id: id1\ndata: First message\n\n';
@@ -237,7 +257,7 @@ describe('SSE Event handling and Listeners', () => {
     expect(listener.mock.calls[0][0].data).toBe('Test message\nmore message');
     expect(listener.mock.calls[0][0].event).toBe(undefined);
     expect(listener.mock.calls[0][0].id).toBe(null);
-  })  
+  })
 
   it('should handle an event with a custom event type', () => {
     sse.xhr.responseText = 'event: customEvent\ndata: Custom event data\n\n';
@@ -250,7 +270,7 @@ describe('SSE Event handling and Listeners', () => {
     expect(customListener.mock.calls[0][0].type).toBe('customEvent');
     expect(customListener.mock.calls[0][0].id).toBe(null);
   });
-  
+
   it('should handle events different field orders', () => {
     sse.xhr.responseText = 'data: Custom event data\nevent: customEvent\nid: 1\n\n';
     sse.xhr.trigger('progress', {});