diff --git a/CONTRIBUTORS.markdown b/CONTRIBUTORS.markdown
index 57245ac5..bbefcaad 100644
--- a/CONTRIBUTORS.markdown
+++ b/CONTRIBUTORS.markdown
@@ -1,6 +1,11 @@
-# CONTRIBUTORS
+# Contributors
 
-- Favonia (@favonia) contributed the majority of the code and its documentation.
-- Brandon @skarekrow) provided a sample OpenBSD `rc.d` script.
-- Thomas (@symgryph) provided sample `systemd` configuration files.
+- Favonia @favonia contributed the majority of the code and its documentation.
+- Brandon @skarekrow provided a sample OpenBSD `rc.d` script.
+
+# Past Contributors
+
+The contributions of the following people were removed when the license was changed from “Apache 2.0” to “Apache 2.0 _with LLVM exceptions”._
+
+- Thomas @symgryph provided sample `systemd` configuration files.
 - @JvdMaat helped improve [`README`](./README.markdown).
diff --git a/README.markdown b/README.markdown
index 75d6a74d..6234cfb3 100644
--- a/README.markdown
+++ b/README.markdown
@@ -105,7 +105,7 @@ CLOUDFLARE_API_TOKEN=YOUR-CLOUDFLARE-API-TOKEN \
 
 ## 🏁 Deployment as a System Service
 
-See [community-contributed sample configurations](./contrib/README.markdown) for systemd and OpenBSD.
+See [community-contributed sample configurations](./contrib/README.markdown) for OpenBSD.
 
 ## 🐋 Deployment with Docker Compose
 
diff --git a/contrib/README.markdown b/contrib/README.markdown
index 52f0f94b..f07a2b5d 100644
--- a/contrib/README.markdown
+++ b/contrib/README.markdown
@@ -1,12 +1,5 @@
 # Community Contributions
 
-## 🆗 systemd
-
-_(contributed by [Thomas @sumgryph](https://github.com/symgryph))_
-
-- See [cloudflare-ddns.service](./systemd/cloudflare-ddns.service) for a sample systemd service unit file.
-- See [cloudflare-ddns.service.env](./systemd/cloudflare-ddns.service.env) for a sample systemd environment file.
-
 ## 🐡 OpenBSD
 
 _(contributed by [Brandon @skarekrow](https://github.com/skarekrow))_
diff --git a/contrib/systemd/cloudflare-ddns.service b/contrib/systemd/cloudflare-ddns.service
deleted file mode 100644
index 10e4777d..00000000
--- a/contrib/systemd/cloudflare-ddns.service
+++ /dev/null
@@ -1,19 +0,0 @@
-[Unit]
-Description=Cloudflare DDNS Updater
-Documentation=https://github.com/favonia/cloudflare-ddns/blob/main/README.markdown
-Requires=network-online.target
-After=network-online.target
-
-[Install]
-WantedBy=multi-user.target
-
-[Service]
-Type=simple
-EnvironmentFile=/etc/cloudflare-ddns/cloudflare-ddns.service.env
-Delegate=yes
-LimitNOFILE=infinity
-LimitNPROC=infinity
-LimitCORE=infinity
-Restart=always
-User=ddns
-ExecStart=/usr/local/bin/ddns
diff --git a/contrib/systemd/cloudflare-ddns.service.env b/contrib/systemd/cloudflare-ddns.service.env
deleted file mode 100644
index 9a24c869..00000000
--- a/contrib/systemd/cloudflare-ddns.service.env
+++ /dev/null
@@ -1,2 +0,0 @@
-CF_API_TOKEN=YOUR-CLOUDFLARE-API-TOKEN
-DOMAINS=example.org,www.example.org,example.io