Update automode-learn-instances.adoc

* add minimum size requirements

Author: geoffcline

latest/ug/automode/automode-learn-instances.adoc

@@ -69,6 +69,8 @@ With EKS Auto Mode, {aws} determines the image (AMI) used for your compute nodes
 
 == Supported instance reference
 
+EKS Auto Mode only supports certain instance types. 
+
 EKS Auto Mode supports the following instance types: 
 
 [cols="1,4",options="header"]
@@ -100,6 +102,14 @@ EKS Auto Mode supports the following instance types:
 |x2iezn, x2iedn, x2idn
 |===
 
+Additionally, EKS Auto Mode will only create EC2 instances that meet the following requirements:
+
+* More than 1 CPU
+* Instance size is not nano, micro or small
+
+For more information, see link:ec2/latest/instancetypes/instance-type-names.html["Amazon EC2 instance type naming conventions",type="documentation"].
+
+
 == Considerations
 
 * EKS Auto Mode automatically formats and configures NVMe local storage on supported instance types. For nodes with multiple NVMe drives, EKS sets up a RAID 0 array. This automation eliminates the need for manual formatting and RAID configuration of local NVMe storage in EKS clusters.
@@ -108,4 +118,4 @@ EKS Auto Mode supports the following instance types:
 ** If you have other types of nodes in your cluster, you need to configure the Neuron Device plugin to not run on auto mode nodes. For more information, see <<associate-workload>>.
 
 
-📝 https://github.com/search?q=repo%3Aawsdocs%2Famazon-eks-user-guide+%5B%23automode-learn-instances%5D&type=code[Edit this page on GitHub]
+📝 https://github.com/search?q=repo%3Aawsdocs%2Famazon-eks-user-guide+%5B%23automode-learn-instances%5D&type=code[Edit this page on GitHub]