diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,8 +1,13 @@
 # Vanilla Kubernetes on VMware vSphere
 
+## Prerequisites
+1. [Packer](https://developer.hashicorp.com/packer/tutorials/docker-get-started/get-started-install-cli) installed on your system
+2. Account in vSphere with [appropriate privileges](https://developer.hashicorp.com/packer/plugins/builders/vsphere/vsphere-iso#required-vsphere-privileges)
+3. [Ubuntu Server 20.04 installation ISO](https://releases.ubuntu.com/20.04.5/) copied to a vSphere datastore
+
 ## Packer
 1. `cd packer`.
-2. Copy `linux-server.example.pkrvars.hcl` to `linux-server.auto.pkrvars.hcl` and update it as appropriate for your environment.
+2. Copy `ubuntu-k8s.example.pkrvars.hcl` to `ubuntu-k8s.auto.pkrvars.hcl` and update it as appropriate for your environment.
 2. Put the SSH private key which corresponds to the `build_key` variable in `packer_cache/ssh_private_key_packer.pem`.
 3. Place any needed internal CA PEM-formatted certs (with `.cer` file extension) in `certs/`. 
 4. Run it with `packer build -on-error=abort -force .`.