diff --git a/content/rancher/v2.6/en/cluster-admin/editing-clusters/gke-config-reference/_index.md b/content/rancher/v2.6/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
index 3fa654e8f84..528d19659c0 100644
--- a/content/rancher/v2.6/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
+++ b/content/rancher/v2.6/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
@@ -220,6 +220,7 @@ _Mutable: no_
 
 You can apply labels to the node pool, which applies the labels to all nodes in the pool.
 
+Invalid labels can prevent upgrades or can prevent Rancher from starting. For details on label syntax requirements, see the [Kubernetes documentation.](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set)
 
 # Group Details
 
diff --git a/content/rancher/v2.6/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md b/content/rancher/v2.6/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md
index fa51c2a2624..990b957f029 100644
--- a/content/rancher/v2.6/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md
+++ b/content/rancher/v2.6/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md
@@ -82,4 +82,4 @@ You can access your cluster after its state is updated to **Active.**
 | EIP Charge Mode | This option will only be shown when `Create EIP` is selected. The options are pay by `BandWidth` and pay by `Traffic`. |
 | EIP Bandwidth Size | This option will only be shown when `Create EIP` is selected. The BandWidth of the EIPs. |
 | Authentication Mode | It means enabling `RBAC` or also enabling `Authenticating Proxy`. If you select `Authenticating Proxy`, the certificate which is used for authenticating proxy will be also required. |
-| Node Label | The labels for the cluster node(s). |
\ No newline at end of file
+| Node Label | The labels for the cluster node(s). Invalid labels can prevent upgrades or can prevent Rancher from starting. For details on label syntax requirements, see the [Kubernetes documentation.](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set) |
\ No newline at end of file
diff --git a/content/rancher/v2.6/en/cluster-provisioning/rke-clusters/node-pools/_index.md b/content/rancher/v2.6/en/cluster-provisioning/rke-clusters/node-pools/_index.md
index 6a64b9c0cf0..7229943f0f6 100644
--- a/content/rancher/v2.6/en/cluster-provisioning/rke-clusters/node-pools/_index.md
+++ b/content/rancher/v2.6/en/cluster-provisioning/rke-clusters/node-pools/_index.md
@@ -35,6 +35,8 @@ After you create a node template in Rancher, it's saved so that you can use this
 
 You can add [labels](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/) on each node template, so that any nodes created from the node template will automatically have these labels on them.
 
+Invalid labels can prevent upgrades or can prevent Rancher from starting. For details on label syntax requirements, see the [Kubernetes documentation.](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set)
+
 ### Node Taints
 
 You can add [taints](https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/) on each node template, so that any nodes created from the node template will automatically have these taints on them.