diff --git a/README.md b/README.md
index a4a73fa..3cd5213 100644
--- a/README.md
+++ b/README.md
@@ -15,3 +15,7 @@ The service is currently in discovery phase and subject to change.
 | Name | Description |
 |:---:|:---:|
 | [`terraform-aws-observability-platform-tenant`](https://github.com/ministryofjustice/terraform-aws-observability-platform-tenant) | Terraform module for creating Observability Platform tenant resources |
+
+### Contributing
+
+The base branch requires all commits to be signed. Learn more about signing commits [here](https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification).