diff --git a/docs/usage/guides/exposing_services.md b/docs/usage/guides/exposing_services.md
index 616332d3..050564fc 100644
--- a/docs/usage/guides/exposing_services.md
+++ b/docs/usage/guides/exposing_services.md
@@ -32,6 +32,7 @@ Therefore, we have to create the cluster in a way, that the internal port 80 (wh
   *Note*: `k3s` deploys [`traefik`](https://github.com/containous/traefik) as the default ingress controller
 
     ```YAML
+    # apiVersion: networking.k8s.io/v1beta1 # for k3s < v1.19
     apiVersion: networking.k8s.io/v1
     kind: Ingress
     metadata: