update node-image-upgrade.md

Author: erik-ha-msft

articles/aks/node-image-upgrade.md

@@ -75,6 +75,9 @@ az aks upgrade \
 
 During the upgrade, check the status of the node images with the following `kubectl` command to get the labels and filter out the current node image information:
 
+>[!NOTE]
+> This command may differ slightly depending on the shell you use. See the [Kubernetes JSONPath documentation][kubernetes-json-path] for more information on Windows/PowerShell environments.
+
 ```azurecli
 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.kubernetes\.azure\.com\/node-image-version}{"\n"}{end}'
 ```
@@ -103,6 +106,9 @@ az aks nodepool upgrade \
 
 During the upgrade, check the status of the node images with the following `kubectl` command to get the labels and filter out the current node image information:
 
+>[!NOTE]
+> This command may differ slightly depending on the shell you use. See the [Kubernetes JSONPath documentation][kubernetes-json-path] for more information on Windows/PowerShell environments.
+
 ```azurecli
 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.kubernetes\.azure\.com\/node-image-version}{"\n"}{end}'
 ```
@@ -156,6 +162,9 @@ az aks nodepool show \
 - [Automatically apply cluster and node pool upgrades with GitHub Actions][github-schedule]
 - Learn more about multiple node pools and how to upgrade node pools with [Create and manage multiple node pools][use-multiple-node-pools].
 
+<!-- LINKS - external -->
+[kubernetes-json-path]: https://kubernetes.io/docs/reference/kubectl/jsonpath/
+
 <!-- LINKS - internal -->
 [upgrade-cluster]: upgrade-cluster.md
 [github-schedule]: node-upgrade-github-actions.md