diff --git a/README.md b/README.md
index 00d9aea..62b665c 100644
--- a/README.md
+++ b/README.md
@@ -178,6 +178,12 @@ A slot claimed after the shift has started always needs an admin to approve it.
 | `afterhours-shift-manager/3cx-client-id` | 3CX OAuth2 client ID |
 | `afterhours-shift-manager/3cx-client-secret` | 3CX OAuth2 client secret |
 
+## Documentation
+
+The canonical map of Sea Haven's AWS infrastructure lives in Confluence. This project's `afterhours-shift-manager` stack is represented there as a Mermaid subgraph.
+
+- **[AWS Architecture Map](https://seahaven.atlassian.net/wiki/spaces/IT/pages/1540098)** (Confluence, IT space, page 1540098)
+
 ## Deployment
 
 Merges to `main` are automatically deployed via **GitHub Actions** using reusable SAM workflows from the Sea Haven org.