diff --git a/README.md b/README.md
index d96458eec..403d63e7f 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,11 @@ manages PostgreSQL clusters on Kubernetes:
 3. Finally, the operator periodically synchronizes the actual state of each
    Postgres cluster with the desired state defined in the cluster's manifest.
 
+Here is a diagram, that summarizes what would be created by the operator, when a
+new Postgres cluster CRD was submitted:
+
+![postgresql-operator](docs/diagrams/operator.png "K8S resources, created by operator")
+
 There is a browser-friendly version of this documentation at
 [postgres-operator.readthedocs.io](https://postgres-operator.readthedocs.io)
 
diff --git a/docs/diagrams/operator.png b/docs/diagrams/operator.png
new file mode 100644
index 000000000..af51bbf08
Binary files /dev/null and b/docs/diagrams/operator.png differ