diff --git a/packages/aws-cdk-lib/aws-autoscaling/lib/auto-scaling-group.ts b/packages/aws-cdk-lib/aws-autoscaling/lib/auto-scaling-group.ts
index 9cc4c5998410a..d3212816022d0 100644
--- a/packages/aws-cdk-lib/aws-autoscaling/lib/auto-scaling-group.ts
+++ b/packages/aws-cdk-lib/aws-autoscaling/lib/auto-scaling-group.ts
@@ -93,6 +93,8 @@ export interface CommonAutoScalingGroupProps {
   /**
    * The SSH keypair to grant access to the instance.
    *
+   * Feature flag `AUTOSCALING_GENERATE_LAUNCH_TEMPLATE` must be enabled to use this property.
+   *
    * `launchTemplate` and `mixedInstancesPolicy` must not be specified when this property is specified.
    *
    * You can either specify `keyPair` or `keyName`, not both.