diff --git a/prepare-vms/README.md b/prepare-vms/README.md
index 83d3c3b6..f325946b 100644
--- a/prepare-vms/README.md
+++ b/prepare-vms/README.md
@@ -23,7 +23,7 @@ And if you want to generate printable cards:
 ## General Workflow
 
 - fork/clone repo
-- create an infrastructure configuration in the `infra` sdirectory
+- create an infrastructure configuration in the `prepare-vms/infra` directory
   (using one of the example files in that directory)
 - create your own setting file from `settings/example.yaml`
 - if necessary, increase allowed open files: `ulimit -Sn 10000`
@@ -134,7 +134,7 @@ wrap         Run this program in a container
 
 ### Example Steps to Launch Azure Instances
 
-- Install the [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest) and authenticate with a valid account
+- Install the [Azure CLI](https://docs.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest) and authenticate with a valid account (`az login`)
 - Customize `azuredeploy.parameters.json`
   - Required:
     - Provide the SSH public key you plan to use for instance configuration
@@ -180,11 +180,16 @@ az group delete --resource-group workshop
 ### Example Steps to Configure Instances from a non-AWS Source
 
 - Copy `infra/example.generic` to `infra/generic`
-- Run `./workshopctl --infra infra/generic --settings settings/...yaml`
+- Run `./workshopctl start --infra infra/generic --settings settings/...yaml`
+- Note the `prepare-vms/tags/TAG/` path that has been auto-created.
 - Launch instances via your preferred method. You'll need to get the instance IPs and be able to SSH into them.
-- Create the file `prepare-vms/tags/TAG/ips.txt`, it should list the IP addresses of the VMs (one per line, without any comments or other info)
-- Continue deployment with `./workshopctl deploy TAG`
-  (all subsequent commands are the same as with VMs created with another method)
+- Edit the file `prepare-vms/tags/TAG/ips.txt`, it should list the IP addresses of the VMs (one per line, without any comments or other info)
+- Continue deployment of cluster configuration with `./workshopctl deploy TAG`
+- Optionally, configure Kubernetes clusters of the size in the settings: workshopctl kube `TAG`
+- Optionally, test your Kubernetes clusters. They may take a little time to become ready: workshopctl kubetest `TAG`
+- Generate cards to print and hand out: workshopctl cards `TAG`
+- Print the cards file: prepare-vms/tags/`TAG`/ips.html
+
 
 ## Even More Details
 
diff --git a/prepare-vms/lib/commands.sh b/prepare-vms/lib/commands.sh
index bac7f9ef..39fc91b5 100644
--- a/prepare-vms/lib/commands.sh
+++ b/prepare-vms/lib/commands.sh
@@ -35,7 +35,7 @@ _cmd_cards() {
 
     info "Cards created. You can view them with:"
     info "xdg-open tags/$TAG/ips.html tags/$TAG/ips.pdf (on Linux)"
-    info "open tags/$TAG/ips.html tags/$TAG/ips.pdf (on MacOS)"
+    info "open tags/$TAG/ips.html (on macOS)"
 }
 
 _cmd deploy "Install Docker on a bunch of running VMs"
@@ -150,7 +150,7 @@ _cmd_kube() {
     sudo ln -sf /home/ubuntu/kubectx/kubens /usr/local/bin/kns &&
     sudo cp /home/ubuntu/kubectx/completion/*.bash /etc/bash_completion.d &&
     [ -d kube-ps1 ] || git clone https://github.com/jonmosco/kube-ps1 &&
-    sudo -u docker sed s/docker-prompt/kube_ps1/ /home/docker/.bashrc &&
+    sudo -u docker sed -i s/docker-prompt/kube_ps1/ /home/docker/.bashrc &&
     sudo -u docker tee -a /home/docker/.bashrc <<EOF
 . /home/ubuntu/kube-ps1/kube-ps1.sh
 KUBE_PS1_PREFIX=""
diff --git a/prepare-vms/lib/infra/aws.sh b/prepare-vms/lib/infra/aws.sh
index 44f8d781..3cdff859 100644
--- a/prepare-vms/lib/infra/aws.sh
+++ b/prepare-vms/lib/infra/aws.sh
@@ -43,6 +43,7 @@ infra_start() {
         --count $COUNT \
         --instance-type ${AWS_INSTANCE_TYPE-t2.medium} \
         --client-token $TAG \
+        --block-device-mapping 'DeviceName=/dev/sda1,Ebs={VolumeSize=20}' \
         --image-id $AMI)
     reservation_id=$(echo "$result" | head -1 | awk '{print $2}')
     info "Reservation ID: $reservation_id"
diff --git a/prepare-vms/lib/infra/generic.sh b/prepare-vms/lib/infra/generic.sh
index e44ab076..ded6069c 100644
--- a/prepare-vms/lib/infra/generic.sh
+++ b/prepare-vms/lib/infra/generic.sh
@@ -1,6 +1,7 @@
 infra_start() {
 	COUNT=$1
 	info "You should now run your provisioning commands for $COUNT machines."
+	info "Note: no machines have been automatically created!"
 	info "Once done, put the list of IP addresses in tags/$TAG/ips.txt"
 	info "(one IP address per line, without any comments or extra lines)."
 	touch tags/$TAG/ips.txt