diff --git a/aws/README.md b/aws/README.md
index f9f51a3..5bad6f8 100644
--- a/aws/README.md
+++ b/aws/README.md
@@ -7,7 +7,7 @@ This template will create a fully-working IPsec VPN server on Amazon Elastic Com
 Available customization parameters:
 
 - Amazon EC2 instance type
-> **Note**: It is possible that not all instance type options offered by this template are available in a specific AWS region. For example, you may not be able to deploy an `m5a.large` instance in `ap-east-1` (hypothetically). In that case, you might experience the following error during deployment: `The requested configuration is currently not supported. Please check the documentation for supported configurations`. Newly released regions are more prone to having this problem as there are less variety of instances. For more info about instance type availability, refer to [https://ec2instances.info](https://ec2instances.info).
+> **Note**: It is possible that not all instance type options offered by this template are available in a specific AWS region. For example, you may not be able to deploy an `m5a.large` instance in `ap-east-1` (hypothetically). In that case, you might experience the following error during deployment: `The requested configuration is currently not supported. Please check the documentation for supported configurations`. Newly released regions are more prone to having this problem as there are less variety of instances. For more info about instance type availability, refer to [https://instances.vantage.sh/](https://instances.vantage.sh/).
 - OS for your VPN server (Ubuntu 20.04/18.04, Debian 9, CentOS 8/7, Amazon Linux 2)
 > **Note:** Before using the Debian 9 image on EC2, you need to first subscribe at the AWS Marketplace: [Debian 9](https://aws.amazon.com/marketplace/pp/B073HW9SP3).
 - Your VPN username
@@ -69,7 +69,7 @@ You will need to save the private key from the **Outputs** tab to a file on your
 
 To apply proper permissions to your private key file, run the following command under the directory where the file is located:
 ```bash
-sudo chmod 400 key-file.pem
+$ sudo chmod 400 key-file.pem
 ```
 
 Example command to login to your EC2 instance using SSH:
@@ -80,4 +80,4 @@ $ ssh -i path/to/your/key-file.pem instance-username@instance-ip-address
 
 ## Author
 
-Copyright (C) 2020-2021 [S. X. Liang](https://github.com/scottpedia)
+Copyright (C) 2020-2022 [S. X. Liang](https://github.com/scottpedia)