diff --git a/charts/ingress-nginx/README.md b/charts/ingress-nginx/README.md
index f34615399..f4486ac91 100644
--- a/charts/ingress-nginx/README.md
+++ b/charts/ingress-nginx/README.md
@@ -367,7 +367,7 @@ Kubernetes: `>=1.20.0-0`
 | controller.metrics.serviceMonitor.relabelings | list | `[]` |  |
 | controller.metrics.serviceMonitor.scrapeInterval | string | `"30s"` |  |
 | controller.metrics.serviceMonitor.targetLabels | list | `[]` |  |
-| controller.minAvailable | int | `1` |  |
+| controller.minAvailable | int | `1` | Define either 'minAvailable' or 'maxUnavailable', never both. |
 | controller.minReadySeconds | int | `0` | `minReadySeconds` to avoid killing pods before we are ready # |
 | controller.name | string | `"controller"` |  |
 | controller.nodeSelector | object | `{"kubernetes.io/os":"linux"}` | Node labels for controller pod assignment # Ref: https://kubernetes.io/docs/user-guide/node-selection/ # |
diff --git a/charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml b/charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml
index 8dfbe9891..899d3cc5d 100644
--- a/charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml
+++ b/charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml
@@ -15,5 +15,9 @@ spec:
     matchLabels:
       {{- include "ingress-nginx.selectorLabels" . | nindent 6 }}
       app.kubernetes.io/component: controller
+  {{- if .Values.controller.minAvailable }}
   minAvailable: {{ .Values.controller.minAvailable }}
+  {{- else if .Values.controller.maxUnavailable }}
+  maxUnavailable: {{ .Values.controller.maxUnavailable }}
+  {{- end }}
 {{- end }}
diff --git a/charts/ingress-nginx/values.yaml b/charts/ingress-nginx/values.yaml
index dc9980d14..c71fd2080 100644
--- a/charts/ingress-nginx/values.yaml
+++ b/charts/ingress-nginx/values.yaml
@@ -345,7 +345,10 @@ controller:
 
   replicaCount: 1
 
+  # -- Define either 'minAvailable' or 'maxUnavailable', never both.
   minAvailable: 1
+  # -- Define either 'minAvailable' or 'maxUnavailable', never both.
+  # maxUnavailable: 1
 
   ## Define requests resources to avoid probe issues due to CPU utilization in busy nodes
   ## ref: https://github.com/kubernetes/ingress-nginx/issues/4735#issuecomment-551204903