diff --git a/jupyter_collaboration/chat_ydoc.py b/jupyter_collaboration/chat_ydoc.py
index c866a33b..1475a88a 100644
--- a/jupyter_collaboration/chat_ydoc.py
+++ b/jupyter_collaboration/chat_ydoc.py
@@ -1,3 +1,6 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 from functools import partial
 import json
 from jupyter_ydoc.ybasedoc import YBaseDoc
diff --git a/packages/docprovider/src/chat/factory.ts b/packages/docprovider/src/chat/factory.ts
index 24507d5e..8d508451 100644
--- a/packages/docprovider/src/chat/factory.ts
+++ b/packages/docprovider/src/chat/factory.ts
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) Jupyter Development Team.
+ * Distributed under the terms of the Modified BSD License.
+ */
+
 import { ChatWidget, IChatModel } from '@jupyter/chat';
 import { IThemeManager } from '@jupyterlab/apputils';
 import { ABCWidgetFactory, DocumentRegistry } from '@jupyterlab/docregistry';
diff --git a/packages/docprovider/src/chat/index.ts b/packages/docprovider/src/chat/index.ts
index dfb3420b..e87e8f8a 100644
--- a/packages/docprovider/src/chat/index.ts
+++ b/packages/docprovider/src/chat/index.ts
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) Jupyter Development Team.
+ * Distributed under the terms of the Modified BSD License.
+ */
+
 export * from './factory';
 export * from './model';
 export * from './widget';
diff --git a/packages/docprovider/src/chat/model.ts b/packages/docprovider/src/chat/model.ts
index a79e4ad4..275a897f 100644
--- a/packages/docprovider/src/chat/model.ts
+++ b/packages/docprovider/src/chat/model.ts
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) Jupyter Development Team.
+ * Distributed under the terms of the Modified BSD License.
+ */
+
 import { ChatModel, IChatMessage, INewMessage, IUser } from '@jupyter/chat';
 import { Delta, MapChange, StateChange, YDocument } from '@jupyter/ydoc';
 import { DocumentRegistry } from '@jupyterlab/docregistry';
diff --git a/packages/docprovider/src/chat/widget.ts b/packages/docprovider/src/chat/widget.ts
index 1fb47605..7ae2971a 100644
--- a/packages/docprovider/src/chat/widget.ts
+++ b/packages/docprovider/src/chat/widget.ts
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) Jupyter Development Team.
+ * Distributed under the terms of the Modified BSD License.
+ */
+
 import { ChatWidget } from '@jupyter/chat';
 import { DocumentRegistry, DocumentWidget } from '@jupyterlab/docregistry';