diff --git a/README.md b/README.md
index d509592..d09bff7 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,9 @@
 # DNSimple Punktum DS upload
 
+> [!IMPORTANT]
+> Deprecated: Punktum.dk has closed the DS-update Service, see
+> <https://punktum.dk/artikler/breaking-changes>
+
 [![Go reference](https://pkg.go.dev/badge/github.com/reload/dnsimple-punktum-dk-ds-upload)](https://pkg.go.dev/github.com/reload/dnsimple-punktum-dk-ds-upload)
 
 Package function is a Google Cloud Function receiving webhook events
diff --git a/README.md.template b/README.md.template
index dbb9f08..c7b6ee3 100644
--- a/README.md.template
+++ b/README.md.template
@@ -1,5 +1,9 @@
 # DNSimple Punktum DS upload
 
+> [!IMPORTANT]
+> Deprecated: Punktum.dk has closed the DS-update Service, see
+> <https://punktum.dk/artikler/breaking-changes>
+
 [![Go reference](https://pkg.go.dev/badge/github.com/reload/dnsimple-punktum-dk-ds-upload)](https://pkg.go.dev/github.com/reload/dnsimple-punktum-dk-ds-upload)
 
 {{ .Doc }}
diff --git a/go.mod b/go.mod
index 8ba9439..0b94e52 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,4 @@
+// Deprecated: Punktum.dk has closed the DS-update Service, see https://punktum.dk/artikler/breaking-changes
 module github.com/reload/dnsimple-punktum-dk-ds-upload
 
 require (