diff --git a/cost-analyzer/values.yaml b/cost-analyzer/values.yaml
index 4b4b880bb..1d49df40b 100644
--- a/cost-analyzer/values.yaml
+++ b/cost-analyzer/values.yaml
@@ -696,6 +696,9 @@ ingress:
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   annotations:
+    ## Starting in kubernetes v1.18, `kubernetes.io/ingress.class` annotation is deprecated.
+    ## Use `spec.ingressClassName` instead of this annotation.
+    ## See: https://kubernetes.io/docs/concepts/services-networking/ingress/#deprecated-annotation
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   paths: ["/"]  # There's no need to route specifically to the pods-- we have an nginx deployed that handles routing