diff --git a/charts/argo-cd/README.md b/charts/argo-cd/README.md
index 28f08c73..62171767 100644
--- a/charts/argo-cd/README.md
+++ b/charts/argo-cd/README.md
@@ -39,6 +39,7 @@ $ helm install --name my-release argo/argo-cd
 | config.repositories                    | string | `nil`                  | Configuration for remote Git repositories for Applications, see [values.yaml](./values.yaml) for format                                                                                                                                                                       |
 | config.resourceCustomizations          | string | `nil`                  | resourceCustomizations can be used to create custom health checks for resources [https://github.com/argoproj/argo-cd/blob/master/docs/operator-manual/health.md#way-1-define-a-custom-health-check-in-argocd-cm-configmap]                                                    |
 | config.url                             | string | `nil`                  | External URL for ArgoCD                                                                                                                                                                                                                                                       |
+| config.instanceLabelKey                | string | `nil`                  | Custom instance label key                                                                                                                                                                                                                                                     |
 | config.webhook.bitbucketSecret         | string | `nil`                  | BitBucket incoming webhook secret                                                                                                                                                                                                                                             |
 | config.webhook.githubSecret            | string | `nil`                  | GitHub incoming webhook secret                                                                                                                                                                                                                                                |
 | config.webhook.gitlabSecret            | string | `nil`                  | GitLab incoming webhook secret                                                                                                                                                                                                                                                |
diff --git a/charts/argo-cd/templates/argocd-cm.yaml b/charts/argo-cd/templates/argocd-cm.yaml
index 98467bb8..9dd30561 100755
--- a/charts/argo-cd/templates/argocd-cm.yaml
+++ b/charts/argo-cd/templates/argocd-cm.yaml
@@ -24,6 +24,9 @@ data:
 {{- if .Values.config.url }}
   url: {{ .Values.config.url }}
 {{- end }}
+{{- if .Values.config.instanceLabelKey }}
+  application.instanceLabelKey: {{ .Values.config.instanceLabelKey }}
+{{- end }}
 {{- if .Values.config.oidcConfig }}
   oidc.config: |
 {{ toYaml .Values.config.oidcConfig | indent 4 }}