diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,14 @@
 <!-- BEGIN_TF_DOCS -->
 # GCP Cloud Run Terraform Module
 
+> :bangbang: Following the release of version `9.0.0`, new features should
+> only be merged into the `master` branch. The legacy `v8` branch should only
+> receive critical bug fixes as needed.
+>
+> This is to encourage our products to migrate to the latest version of this
+> module, benefiting from its many improvements and standardising its usage
+> across our many infrastructure repositories.
+
 This module manages the deployment of containerised applications on Cloud Run.
 It includes the following functionality:
 
diff --git a/docs/templates/header.md b/docs/templates/header.md
index e8e229296dcda703b1a8d388eae89f22c9f73539..a760427ed901aa6307f83580cacd32691764e0d2 100644
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+++ b/docs/templates/header.md
@@ -1,5 +1,13 @@
 # GCP Cloud Run Terraform Module
 
+> :bangbang: Following the release of version `9.0.0`, new features should
+> only be merged into the `master` branch. The legacy `v8` branch should only
+> receive critical bug fixes as needed.
+>
+> This is to encourage our products to migrate to the latest version of this
+> module, benefiting from its many improvements and standardising its usage
+> across our many infrastructure repositories.
+
 This module manages the deployment of containerised applications on Cloud Run.
 It includes the following functionality: