diff --git a/api-ref/source/conf.py b/api-ref/source/conf.py
index b36a2795..dc08ba41 100644
--- a/api-ref/source/conf.py
+++ b/api-ref/source/conf.py
@@ -1,15 +1,6 @@
-# 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.
 #
+# SPDX-License-Identifier: Apache-2.0
+
 # stx-metal API reference documentation build configuration file
 #
 # This file is execfile()d with the current directory set to
diff --git a/doc/source/conf.py b/doc/source/conf.py
index a3948490..90fc2c29 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
-#
+# SPDX-License-Identifier: Apache-2.0
+
 # Configuration file for the Sphinx documentation builder.
 #
 # This file does only contain a selection of the most common options. For a
diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 53db678f..13ea495d 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -1,16 +1,6 @@
 # -*- coding: utf-8 -*-
-# 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.
+# SPDX-License-Identifier: Apache-2.0
 
 # stx-metal Release Notes documentation build configuration file.
 #