diff --git a/examples/Workflow/WorkflowExternalInteraction/Activities/ApproveActivity.cs b/examples/Workflow/WorkflowExternalInteraction/Activities/ApproveActivity.cs
index 0a17f130..48048e19 100644
--- a/examples/Workflow/WorkflowExternalInteraction/Activities/ApproveActivity.cs
+++ b/examples/Workflow/WorkflowExternalInteraction/Activities/ApproveActivity.cs
@@ -1,4 +1,17 @@
-using Dapr.Workflow;
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// 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.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
 
 namespace WorkflowExternalInteraction.Activities;
 
diff --git a/examples/Workflow/WorkflowExternalInteraction/Activities/RejectActivity.cs b/examples/Workflow/WorkflowExternalInteraction/Activities/RejectActivity.cs
index 87656d9b..765d31a2 100644
--- a/examples/Workflow/WorkflowExternalInteraction/Activities/RejectActivity.cs
+++ b/examples/Workflow/WorkflowExternalInteraction/Activities/RejectActivity.cs
@@ -1,4 +1,17 @@
-using Dapr.Workflow;
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// 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.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
 
 namespace WorkflowExternalInteraction.Activities;
 
diff --git a/examples/Workflow/WorkflowExternalInteraction/Program.cs b/examples/Workflow/WorkflowExternalInteraction/Program.cs
index 6e3c12f8..b83527d2 100644
--- a/examples/Workflow/WorkflowExternalInteraction/Program.cs
+++ b/examples/Workflow/WorkflowExternalInteraction/Program.cs
@@ -1,4 +1,17 @@
-using Dapr.Workflow;
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// 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.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using WorkflowExternalInteraction.Activities;
diff --git a/examples/Workflow/WorkflowExternalInteraction/Workflows/DemoWorkflow.cs b/examples/Workflow/WorkflowExternalInteraction/Workflows/DemoWorkflow.cs
index ff6b0eb5..ba815a80 100644
--- a/examples/Workflow/WorkflowExternalInteraction/Workflows/DemoWorkflow.cs
+++ b/examples/Workflow/WorkflowExternalInteraction/Workflows/DemoWorkflow.cs
@@ -1,4 +1,17 @@
-using Dapr.Workflow;
+// ------------------------------------------------------------------------
+// Copyright 2024 The Dapr Authors
+// 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.
+// ------------------------------------------------------------------------
+
+using Dapr.Workflow;
 using WorkflowExternalInteraction.Activities;
 
 namespace WorkflowExternalInteraction.Workflows;