diff --git a/charts/k8s-reporter/README.md b/charts/k8s-reporter/README.md
index 8c8a4ba9f..c2d29ca2f 100644
--- a/charts/k8s-reporter/README.md
+++ b/charts/k8s-reporter/README.md
@@ -11,7 +11,7 @@ The chart allows you to create a Kubernetes cronjob and all its necessary RBAC t
 
 ## Prerequisites
 
-- A Kubernetes cluster
+- A Kubernetes cluster (minimum supported version is `v1.21`)
 - Helm v3.0+
 - Create a secret for the Kosli API token which will be used for reporting. You can create a secret by running: `kubectl create secret generic <secret-name> --from-literal=<secret-key>=<your-api-key>`
 
diff --git a/docs.kosli.com/content/helm/_index.md b/docs.kosli.com/content/helm/_index.md
index 8c8a4ba9f..c2d29ca2f 100644
--- a/docs.kosli.com/content/helm/_index.md
+++ b/docs.kosli.com/content/helm/_index.md
@@ -11,7 +11,7 @@ The chart allows you to create a Kubernetes cronjob and all its necessary RBAC t
 
 ## Prerequisites
 
-- A Kubernetes cluster
+- A Kubernetes cluster (minimum supported version is `v1.21`)
 - Helm v3.0+
 - Create a secret for the Kosli API token which will be used for reporting. You can create a secret by running: `kubectl create secret generic <secret-name> --from-literal=<secret-key>=<your-api-key>`