diff --git a/kube/postgres.libsonnet b/kube/postgres.libsonnet
index 8208662..e89e9db 100644
--- a/kube/postgres.libsonnet
+++ b/kube/postgres.libsonnet
@@ -16,6 +16,8 @@
         username: error "username must be set",
         # not literal, instead ref for env (like { secretKeyRef: ... })
         password: error "password must be set",
+
+        storageSize: "30Gi",
     },
 
     makeName(suffix):: cfg.prefix + suffix,
@@ -36,7 +38,7 @@
             accessModes: [ "ReadWriteOnce" ],
             resources: {
                 requests: {
-                    storage: "30Gi",
+                    storage: cfg.storageSize,
                 },
             },
         },
@@ -74,6 +76,7 @@
             },
         },
     },
+
     svc: kube.Service(postgres.makeName("postgres")) {
         metadata+: postgres.metadata,
         target_pod:: postgres.deployment.spec.template,