diff --git a/lib/ansible/plugins/inventory/aws_ec2.py b/lib/ansible/plugins/inventory/aws_ec2.py
index 3a3d46167de..da36dea734a 100644
--- a/lib/ansible/plugins/inventory/aws_ec2.py
+++ b/lib/ansible/plugins/inventory/aws_ec2.py
@@ -29,6 +29,7 @@ DOCUMENTATION = '''
         iam_role_arn:
           description: The ARN of the IAM role to assume to perform the inventory lookup. You should still provide AWS
               credentials with enough privilege to perform the AssumeRole action.
+          version_added: '2.9'
         regions:
           description:
               - A list of regions in which to describe EC2 instances.