diff --git a/projects/manage-offences-and-delius/README.md b/projects/manage-offences-and-delius/README.md
index 0db07b027e..e5088eb53e 100644
--- a/projects/manage-offences-and-delius/README.md
+++ b/projects/manage-offences-and-delius/README.md
@@ -1,3 +1,17 @@
-# manage-offences-and-delius
+# Manage Offences and Delius
 
-// TODO Describe the service
\ No newline at end of file
+## Business Need
+
+Inbound service that responds to events raised by the HMPPS Manage Offences service when there are changes to the set of [CJS Offence Codes](https://www.criminaljusticehub.org.uk/jargon-buster/cjs-offence-code/) managed by that service. Any changes to the set of offence codes is reflected in the Delius database. This ensures that Delius is up-to-date with the common set of offence codes used across HMPPS Digital services.
+
+## Interfaces
+
+### Message Formats
+
+The service responds to an HMPPS Domain Event message via an
+[SQS Queue](https://github.com/ministryofjustice/cloud-platform-environments/blob/main/namespaces/live.cloud-platform.service.justice.gov.uk/hmpps-probation-integration-services-prod/resources/manage-offences-and-delius-queue.tf).
+The events are raised by the [Manage Offences API](https://github.com/ministryofjustice/hmpps-manage-offences-api) when a CJS offence code is either created or updated.
+
+| Business Event             | Message Class      | Message Event Type / Filter     |
+|----------------------------|--------------------|---------------------------------|
+| Change to CJS offence code | HMPPS Domain Event | manage-offences.offence.changed |
diff --git a/projects/manage-offences-and-delius/tech-docs/source/async-api-reference.html.md.erb b/projects/manage-offences-and-delius/tech-docs/source/async-api-reference.html.md.erb
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+++ b/projects/manage-offences-and-delius/tech-docs/source/async-api-reference.html.md.erb
@@ -0,0 +1,9 @@
+---
+title: AsyncAPI Reference
+source_url: 'https://github.com/ministryofjustice/hmpps-probation-integration-services/blob/main/projects/manage-offences-and-delius/tech-docs/source/async-api-reference.html.md.erb'
+weight: 30
+---
+
+# ASyncAPI Reference
+
+* [ASyncAPI Spec](https://studio.asyncapi.com/?url=https://raw.githubusercontent.com/ministryofjustice/hmpps-probation-integration-services/main/projects/manage-offences-and-delius/tech-docs/spec/async-api.yaml&readOnly)
diff --git a/projects/manage-offences-and-delius/tech-docs/spec/async-api.yaml b/projects/manage-offences-and-delius/tech-docs/spec/async-api.yaml
new file mode 100644
index 0000000000..1442eda755
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+++ b/projects/manage-offences-and-delius/tech-docs/spec/async-api.yaml
@@ -0,0 +1,23 @@
+asyncapi: 2.6.0
+info:
+  title: Manage Offences and Delius
+  description: Reflect changes to CJS offence codes in Delius
+  version: 0.1.0
+
+servers:
+  development:
+    url: https://sqs.eu-west-2.amazonaws.com/754256621582/probation-integration-dev-manage-offences-and-delius-queue
+    protocol: sqs
+  preproduction:
+    url: https://sqs.eu-west-2.amazonaws.com/754256621582/probation-integration-preprod-manage-offences-and-delius-queue
+    protocol: sqs
+  production:
+    url: https://sqs.eu-west-2.amazonaws.com/754256621582/probation-integration-prod-manage-offences-and-delius-queue
+    protocol: sqs
+
+channels:
+  hmpps-domain-events/manage-offences-and-delius/offence-changed:
+    subscribe:
+      operationId: 
+      message:
+        $ref: https://raw.githubusercontent.com/ministryofjustice/hmpps-domain-events/main/spec/schemas/manage-offences/offence-changed.yml