diff --git a/docs/README.md b/docs/README.md
index 34a660c7b..ba0fd1e48 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,3 +1,12 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2021 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 Aaron Raimist
+SPDX-FileCopyrightText: 2019 Lyubomir Popov
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Table of Contents
 
 ## ⬇️ Installaton guides <!-- NOTE: the 🚀 emoji is used by "Getting started" on README.md -->
diff --git a/docs/configuring-dns.md b/docs/configuring-dns.md
index 51e30d69e..a5237889f 100644
--- a/docs/configuring-dns.md
+++ b/docs/configuring-dns.md
@@ -1,3 +1,20 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2024 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 - 2024 MDAD project contributors
+SPDX-FileCopyrightText: 2019 Edgars Voroboks
+SPDX-FileCopyrightText: 2020 - 2021 Aaron Raimist
+SPDX-FileCopyrightText: 2020 Marcel Partap
+SPDX-FileCopyrightText: 2020 Rónán Duddy
+SPDX-FileCopyrightText: 2021 Yannick Goossens
+SPDX-FileCopyrightText: 2022 Nikita Chernyi
+SPDX-FileCopyrightText: 2022 Julian Foad
+SPDX-FileCopyrightText: 2023 Johan Swetzén
+SPDX-FileCopyrightText: 2023 Pierre 'McFly' Marty
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Configuring your DNS settings
 
 <sup>[Prerequisites](prerequisites.md) > Configuring your DNS settings > [Getting the playbook](getting-the-playbook.md) > [Configuring the playbook](configuring-playbook.md) > [Installing](installing.md)</sup>
diff --git a/docs/getting-the-playbook.md b/docs/getting-the-playbook.md
index 4db76c5c6..6607cae49 100644
--- a/docs/getting-the-playbook.md
+++ b/docs/getting-the-playbook.md
@@ -1,3 +1,10 @@
+<!--
+SPDX-FileCopyrightText: 2019 Slavi Pantaleev
+SPDX-FileCopyrightText: 2024 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Getting the playbook
 
 <sup>[Prerequisites](prerequisites.md) > [Configuring your DNS settings](configuring-dns.md) > Getting the playbook > [Configuring the playbook](configuring-playbook.md) > [Installing](installing.md)</sup>
diff --git a/docs/installing.md b/docs/installing.md
index 860e8d9bf..e0bf44404 100644
--- a/docs/installing.md
+++ b/docs/installing.md
@@ -1,3 +1,17 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2023 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 Aaron Raimist
+SPDX-FileCopyrightText: 2018 - 2024 MDAD project contributors
+SPDX-FileCopyrightText: 2019 Edgars Voroboks
+SPDX-FileCopyrightText: 2019 Michael Haak
+SPDX-FileCopyrightText: 2020 Kevin Lanni
+SPDX-FileCopyrightText: 2024 Nikita Chernyi
+SPDX-FileCopyrightText: 2024 Mitja Jež
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Installing
 
 <sup>[Prerequisites](prerequisites.md) > [Configuring your DNS settings](configuring-dns.md) > [Getting the playbook](getting-the-playbook.md) > [Configuring the playbook](configuring-playbook.md) > Installing</sup>
diff --git a/docs/maintenance-and-troubleshooting.md b/docs/maintenance-and-troubleshooting.md
index 99205697e..21d1c07ae 100644
--- a/docs/maintenance-and-troubleshooting.md
+++ b/docs/maintenance-and-troubleshooting.md
@@ -1,3 +1,14 @@
+<!--
+SPDX-FileCopyrightText: 2018 Aaron Raimist
+SPDX-FileCopyrightText: 2019 - 2024 Slavi Pantaleev
+SPDX-FileCopyrightText: 2019 - 2020 MDAD project contributors
+SPDX-FileCopyrightText: 2019 Noah Fleischmann
+SPDX-FileCopyrightText: 2020 Marcel Partap
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Maintenance and Troubleshooting
 
 ## Maintenance
diff --git a/docs/maintenance-upgrading-services.md b/docs/maintenance-upgrading-services.md
index ca1ea78f1..c6ef5f62d 100644
--- a/docs/maintenance-upgrading-services.md
+++ b/docs/maintenance-upgrading-services.md
@@ -1,3 +1,14 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2023 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 Aaron Raimist
+SPDX-FileCopyrightText: 2024 MDAD project contributors
+SPDX-FileCopyrightText: 2024 Nikita Chernyi
+SPDX-FileCopyrightText: 2024 Felix Stupp
+SPDX-FileCopyrightText: 2024 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Upgrading the Matrix services
 
 This playbook not only installs the various Matrix services for you, but can also upgrade them as new versions are made available.
diff --git a/docs/prerequisites.md b/docs/prerequisites.md
index 94445befe..8b813f1bd 100644
--- a/docs/prerequisites.md
+++ b/docs/prerequisites.md
@@ -1,3 +1,14 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2025 Slavi Pantaleev
+SPDX-FileCopyrightText: 2019 - 2022 Aaron Raimist
+SPDX-FileCopyrightText: 2019 - 2023 MDAD project contributors
+SPDX-FileCopyrightText: 2024 Nikita Chernyi
+SPDX-FileCopyrightText: 2024 Fabio Bonelli
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Prerequisites
 
 <sup>Prerequisites > [Configuring your DNS settings](configuring-dns.md) > [Getting the playbook](getting-the-playbook.md) > [Configuring the playbook](configuring-playbook.md) > [Installing](installing.md)</sup>
diff --git a/docs/uninstalling.md b/docs/uninstalling.md
index 4c70082f5..1a0f3f6ef 100644
--- a/docs/uninstalling.md
+++ b/docs/uninstalling.md
@@ -1,3 +1,11 @@
+<!--
+SPDX-FileCopyrightText: 2018 - 2022 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 MDAD project contributors
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
 # Uninstalling
 
 > [!WARNING]