diff --git a/stable/prometheus-adapter/Chart.yaml b/stable/prometheus-adapter/Chart.yaml
index 8ad9569d93..41ac38764b 100644
--- a/stable/prometheus-adapter/Chart.yaml
+++ b/stable/prometheus-adapter/Chart.yaml
@@ -1,5 +1,5 @@
 name: prometheus-adapter
-version: v0.2.3
+version: v0.3.0
 appVersion: v0.4.1
 description: A Helm chart for k8s prometheus adapter
 home: https://github.com/DirectXMan12/k8s-prometheus-adapter
diff --git a/stable/prometheus-adapter/README.md b/stable/prometheus-adapter/README.md
index 5d8db54a84..62fe3872a1 100644
--- a/stable/prometheus-adapter/README.md
+++ b/stable/prometheus-adapter/README.md
@@ -49,6 +49,7 @@ The following table lists the configurable parameters of the Prometheus Adapter
 | `resources`                     | CPU/Memory resource requests/limits                                             | `{}`                                        |
 | `rules.default`                 | If `true`, enable a set of default rules in the configmap                       | `true`                                      |
 | `rules.custom`                  | A list of custom configmap rules                                                | `[]`                                        |
+| `rules.existing`                | The name of an existing configMap with rules. Overrides default and custom.     | ``                                          |                                                                                                        
 | `service.annotations`           | Annotations to add to the service                                               | `{}`                                        |
 | `service.port`                  | Service port to expose                                                          | `443`                                       |
 | `service.type`                  | Type of service to create                                                       | `ClusterIP`                                 |
diff --git a/stable/prometheus-adapter/templates/custom-metrics-apiserver-deployment.yaml b/stable/prometheus-adapter/templates/custom-metrics-apiserver-deployment.yaml
index 26aaed9e0e..4321fc5a30 100644
--- a/stable/prometheus-adapter/templates/custom-metrics-apiserver-deployment.yaml
+++ b/stable/prometheus-adapter/templates/custom-metrics-apiserver-deployment.yaml
@@ -95,7 +95,11 @@ spec:
       volumes:
       - name: config
         configMap:
+          {{- if .Values.rules.existing }}
+          name: {{ .Values.rules.existing }}
+          {{- else }}
           name: {{ template "k8s-prometheus-adapter.fullname" . }}
+          {{- end }}
       - name: tmp
         emptyDir: {}
 {{- if .Values.tls.enable }}
diff --git a/stable/prometheus-adapter/templates/custom-metrics-configmap.yaml b/stable/prometheus-adapter/templates/custom-metrics-configmap.yaml
index e267861111..e30aefd8f5 100644
--- a/stable/prometheus-adapter/templates/custom-metrics-configmap.yaml
+++ b/stable/prometheus-adapter/templates/custom-metrics-configmap.yaml
@@ -1,3 +1,4 @@
+{{- if not .Values.rules.existing -}}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -81,4 +82,4 @@ data:
 {{- if .Values.rules.custom }}
 {{ toYaml .Values.rules.custom | indent 4 }}
 {{- end -}}
-
+{{- end -}}
\ No newline at end of file
diff --git a/stable/prometheus-adapter/values.yaml b/stable/prometheus-adapter/values.yaml
index f91f200eec..070bc462d2 100644
--- a/stable/prometheus-adapter/values.yaml
+++ b/stable/prometheus-adapter/values.yaml
@@ -48,6 +48,9 @@ rules:
 #     matches: ""
 #     as: "my_custom_metric"
 #   metricsQuery: sum(<<.Series>>{<<.LabelMatchers>>}) by (<<.GroupBy>>)
+  # Mounts a configMap with pre-generated rules for use. Overrides the
+  # default and custom entries
+  existing:
 
 service:
   annotations: {}