diff --git a/api_generator/Rakefile b/api_generator/Rakefile
index d1128f548..4c8552338 100644
--- a/api_generator/Rakefile
+++ b/api_generator/Rakefile
@@ -1,3 +1,11 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+
+# frozen_string_literal: true
+
 require 'rake'
 require 'active_support/all'
 
diff --git a/api_generator/lib/components/argument.rb b/api_generator/lib/components/argument.rb
index 677fd2f50..468d52cee 100644
--- a/api_generator/lib/components/argument.rb
+++ b/api_generator/lib/components/argument.rb
@@ -1,3 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+
 # frozen_string_literal: true
 
 # Represents an argument to an API action
diff --git a/api_generator/lib/components/namespace.rb b/api_generator/lib/components/namespace.rb
index d8106e54a..d058e9b03 100644
--- a/api_generator/lib/components/namespace.rb
+++ b/api_generator/lib/components/namespace.rb
@@ -1,3 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+
 # frozen_string_literal: true
 
 require_relative 'action'
diff --git a/api_generator/lib/spec_hash.rb b/api_generator/lib/spec_hash.rb
index 2c103bb37..4b8e1c544 100644
--- a/api_generator/lib/spec_hash.rb
+++ b/api_generator/lib/spec_hash.rb
@@ -1,3 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+
 # frozen_string_literal: true
 
 require 'yaml'