Add specific instruction for upgrading NGF from OSS to Plus

site/content/installation/installing-ngf/helm.md

@@ -37,7 +37,7 @@ helm install ngf oci://ghcr.io/nginxinc/charts/nginx-gateway-fabric --create-nam
 
 ##### For NGINX Plus
 
-{{< note >}}Replace `private-registry.nginx.com` with the proper registry for your NGINX Plus image, and if applicable, replace `nginx-plus-registry-secret` with your Secret name containing the registry credentials.{{< /note >}}
+{{< note >}}If applicable, replace the F5 Container registry `private-registry.nginx.com` with your internal registry for your NGINX Plus image, and replace `nginx-plus-registry-secret` with your Secret name containing the registry credentials.{{< /note >}}
 
 {{< important >}}Ensure that you [Enable Usage Reporting]({{< relref "installation/usage-reporting.md" >}}) when installing.{{< /important >}}
 
@@ -183,6 +183,20 @@ To upgrade the CRDs, take the following steps:
 
    If needed, replace `ngf` with your chosen release name.
 
+## How to upgrade from NGINX OSS to NGINX Plus
+
+- To upgrade from NGINX OSS to NGINX Plus, update the Helm command to include the necessary values for Plus:
+
+  {{< note >}}If applicable, replace the F5 Container registry `private-registry.nginx.com` with your internal registry for your NGINX Plus image, and replace `nginx-plus-registry-secret` with your Secret name containing the registry credentials.{{< /note >}}
+
+  {{< important >}}Ensure that you [Enable Usage Reporting]({{< relref "installation/usage-reporting.md" >}}) when installing.{{< /important >}}
+
+  ```shell
+  helm upgrade ngf oci://ghcr.io/nginxinc/charts/nginx-gateway-fabric  --set nginx.image.repository=private-registry.nginx.com/nginx-gateway-fabric/nginx-plus --set nginx.plus=true --set serviceAccount.imagePullSecret=nginx-plus-registry-secret -n nginx-gateway
+  ```
+
+  If needed, replace `ngf` with your chosen release name.
+
 ## Delay pod termination for zero downtime upgrades {#configure-delayed-pod-termination-for-zero-downtime-upgrades}
 
 {{< include "installation/delay-pod-termination/delay-pod-termination-overview.md" >}}

site/content/installation/installing-ngf/manifests.md

@@ -167,12 +167,26 @@ To upgrade NGINX Gateway Fabric and get the latest features and improvements, ta
 
 1. **Upgrade NGINX Gateway Fabric deployment:**
 
-   - To upgrade the deployment, run:
+   - To upgrade your OSS deployment, run:
 
      ```shell
      kubectl apply -f https://github.com/nginxinc/nginx-gateway-fabric/releases/download/v1.2.0/nginx-gateway.yaml
      ```
 
+   - To upgrade your Plus deployment:
+
+     Download the [deployment YAML](https://github.com/nginxinc/nginx-gateway-fabric/releases/download/v1.2.0/nginx-plus-gateway.yaml).
+
+     Update the `nginx-plus-gateway.yaml` file to include your chosen NGINX Plus image from the F5 Container registry or your custom image.
+
+     ```shell
+     kubectl apply -f nginx-plus-gateway.yaml
+     ```
+
+   - To upgrade the deployment from NGINX OSS to NGINX Plus, follow the above instructions for upgrading your Plus deployment.
+
+    {{< important >}}Ensure that you [Enable Usage Reporting]({{< relref "installation/usage-reporting.md" >}}) before applying.{{< /important >}}
+
 ## Delay pod termination for zero downtime upgrades {#configure-delayed-pod-termination-for-zero-downtime-upgrades}
 
 {{< include "installation/delay-pod-termination/delay-pod-termination-overview.md" >}}