diff --git a/doc/source/autoscaling.rst b/doc/source/autoscaling.rst
index f566b2159..cd6a8e82a 100644
--- a/doc/source/autoscaling.rst
+++ b/doc/source/autoscaling.rst
@@ -34,7 +34,7 @@ Test that it works by running the following commands from your local machine:
     # Tear down the cluster.
     $ ray down ray/python/ray/autoscaler/aws/example-full.yaml
 
-.. tip:: For the AWS node configuration, you can set ``"ImageId: DEFAULT"`` to automatically use the newest `Deep Learning AMI <https://aws.amazon.com/machine-learning/amis/>`_ for your region. For example, ``head_node: {InstanceType: c5.xlarge, ImageId: DEFAULT}``.
+.. tip:: For the AWS node configuration, you can set ``"ImageId: latest_dlami"`` to automatically use the newest `Deep Learning AMI <https://aws.amazon.com/machine-learning/amis/>`_ for your region. For example, ``head_node: {InstanceType: c5.xlarge, ImageId: latest_dlami}``.
 
 GCP
 ~~~
diff --git a/python/ray/autoscaler/aws/config.py b/python/ray/autoscaler/aws/config.py
index efadbdd8b..9d597c345 100644
--- a/python/ray/autoscaler/aws/config.py
+++ b/python/ray/autoscaler/aws/config.py
@@ -278,18 +278,18 @@ def _check_ami(config):
         # If we do not provide a default AMI for the given region, noop.
         return
 
-    if config["head_node"].get("ImageId", "").lower() == "DEFAULT":
+    if config["head_node"].get("ImageId", "").lower() == "latest_dlami":
         config["head_node"]["ImageId"] = default_ami
-        logger.info("_check_ami: head node ImageId specified as 'DEFAULT'. "
+        logger.info("_check_ami: head node ImageId is 'latest_dlami'. "
                     "Using '{ami_id}', which is the default {ami_name} "
                     "for your region ({region}).".format(
                         ami_id=default_ami,
                         ami_name=DEFAULT_AMI_NAME,
                         region=region))
 
-    if config["worker_nodes"].get("ImageId", "").lower() == "DEFAULT":
+    if config["worker_nodes"].get("ImageId", "").lower() == "latest_dlami":
         config["worker_nodes"]["ImageId"] = default_ami
-        logger.info("_check_ami: worker nodes ImageId specified as 'DEFAULT'. "
+        logger.info("_check_ami: worker nodes ImageId is 'latest_dlami'. "
                     "Using '{ami_id}', which is the default {ami_name} "
                     "for your region ({region}).".format(
                         ami_id=default_ami,