diff --git a/packages/aws-cdk-lib/aws-eks/README.md b/packages/aws-cdk-lib/aws-eks/README.md
index b58b5f93b8747..573955dc826ad 100644
--- a/packages/aws-cdk-lib/aws-eks/README.md
+++ b/packages/aws-cdk-lib/aws-eks/README.md
@@ -615,6 +615,9 @@ new eks.Cluster(this, 'HelloEKS', {
 });
 ```
 
+The `albController` requires `defaultCapacity` or at least one nodegroup. If there's no `defaultCapacity` or available
+nodegroup for the cluster, the `albController` deployment would fail.
+
 Querying the controller pods should look something like this:
 
 ```console