diff --git a/content/rancher/v2.6/en/installation/install-rancher-on-k8s/_index.md b/content/rancher/v2.6/en/installation/install-rancher-on-k8s/_index.md
index 78ce1d03de7..bafbb22a53b 100644
--- a/content/rancher/v2.6/en/installation/install-rancher-on-k8s/_index.md
+++ b/content/rancher/v2.6/en/installation/install-rancher-on-k8s/_index.md
@@ -122,6 +122,9 @@ This step is only required to use certificates issued by Rancher's generated CA
 These instructions are adapted from the [official cert-manager documentation](https://cert-manager.io/docs/installation/kubernetes/#installing-with-helm).
 
 ```
+If you have installed the CRDs manually instead of with the --set installCRDs=true option added to your Helm install command, you should upgrade your CRD resources before upgrading the Helm chart:
+kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/<version>/cert-manager.crds.yaml
+
 # Add the Jetstack Helm repository
 helm repo add jetstack https://charts.jetstack.io