diff --git a/content/rancher/v2.5/en/cluster-admin/editing-clusters/eks-config-reference/_index.md b/content/rancher/v2.5/en/cluster-admin/editing-clusters/eks-config-reference/_index.md
index 9fa6ea0ce89..bb4e31086c1 100644
--- a/content/rancher/v2.5/en/cluster-admin/editing-clusters/eks-config-reference/_index.md
+++ b/content/rancher/v2.5/en/cluster-admin/editing-clusters/eks-config-reference/_index.md
@@ -148,7 +148,7 @@ The following settings are also configurable. All of these except for the "Node
 | Desired ASG Size | The desired number of instances. |
 | Maximum ASG Size | The maximum number of instances. This setting won't take effect until the [Cluster Autoscaler](https://docs.aws.amazon.com/eks/latest/userguide/cluster-autoscaler.html) is installed. |
 | Minimum ASG Size | The minimum number of instances. This setting won't take effect until the [Cluster Autoscaler](https://docs.aws.amazon.com/eks/latest/userguide/cluster-autoscaler.html) is installed. |
-| Labels | Kubernetes labels applied to the nodes in the managed node group. |
+| Labels | Kubernetes labels applied to the nodes in the managed node group. Note: 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) |
 | Tags | These are tags for the managed node group and do not propagate to any of the associated resources. |
 
 
diff --git a/content/rancher/v2.5/en/cluster-admin/editing-clusters/gke-config-reference/_index.md b/content/rancher/v2.5/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
index 1738c2aef5f..f85340bf660 100644
--- a/content/rancher/v2.5/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
+++ b/content/rancher/v2.5/en/cluster-admin/editing-clusters/gke-config-reference/_index.md
@@ -237,6 +237,7 @@ _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
 
@@ -309,6 +310,8 @@ The shorter the refresh window, the less likely any race conditions will occur,
 
 Add Kubernetes [labels](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/) or [annotations](https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/) to the cluster.
 
+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)
+
 # Kubernetes Options
 
 ### Location Type
@@ -429,6 +432,8 @@ When you apply a taint to a node, only Pods that tolerate the taint are allowed
 ### Node Labels
 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)
+
 ## Security Options
 
 ### Service Account
diff --git a/content/rancher/v2.5/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md b/content/rancher/v2.5/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md
index 1ef8a38397a..edaa4a47a8e 100644
--- a/content/rancher/v2.5/en/cluster-provisioning/hosted-kubernetes-clusters/cce/_index.md
+++ b/content/rancher/v2.5/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/v2.5/en/cluster-provisioning/rke-clusters/node-pools/_index.md b/content/rancher/v2.5/en/cluster-provisioning/rke-clusters/node-pools/_index.md
index 52744238b12..cadb3209a2a 100644
--- a/content/rancher/v2.5/en/cluster-provisioning/rke-clusters/node-pools/_index.md
+++ b/content/rancher/v2.5/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.