diff --git a/runtime/Cpp/demo/Linux/main.cpp b/runtime/Cpp/demo/Linux/main.cpp
index 5fa0afdbc..242d52447 100644
--- a/runtime/Cpp/demo/Linux/main.cpp
+++ b/runtime/Cpp/demo/Linux/main.cpp
@@ -1,3 +1,8 @@
+/* Copyright (c) 2012 The ANTLR Project Contributors. All rights reserved.
+ * Use is of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
 //
 //  main.cpp
 //  antlr4-cpp-demo
diff --git a/runtime/Cpp/demo/Mac/antlr4-cpp-demo/main.cpp b/runtime/Cpp/demo/Mac/antlr4-cpp-demo/main.cpp
index 1222e32c8..263acc6f5 100644
--- a/runtime/Cpp/demo/Mac/antlr4-cpp-demo/main.cpp
+++ b/runtime/Cpp/demo/Mac/antlr4-cpp-demo/main.cpp
@@ -1,3 +1,8 @@
+/* Copyright (c) 2012 The ANTLR Project Contributors. All rights reserved.
+ * Use is of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
 //
 //  main.cpp
 //  antlr4-cpp-demo
diff --git a/runtime/Cpp/demo/Windows/antlr4-cpp-demo/main.cpp b/runtime/Cpp/demo/Windows/antlr4-cpp-demo/main.cpp
index 94bccd18e..ae3326ead 100644
--- a/runtime/Cpp/demo/Windows/antlr4-cpp-demo/main.cpp
+++ b/runtime/Cpp/demo/Windows/antlr4-cpp-demo/main.cpp
@@ -1,4 +1,9 @@
-//
+/* Copyright (c) 2012 The ANTLR Project Contributors. All rights reserved.
+ * Use is of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+//
 //  main.cpp
 //  antlr4-cpp-demo
 //