diff --git a/README.md b/README.md
index 3e281183f03ab335210e9ac4099b112a13697e48..825955c4095de715506521d186010265c32f5e23 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,10 @@ To deploy this role to a managed host, the following software must be installed
 ## Quick start
 
 ```
-	ansible-playbook site.yml -b -K
+	ansible-playbook site.yml -i ~/inventory_tmp.yml --become
 ```
 
-## General usage
+## General Ansible usage
 
 Most options already have sensible defaults in `ansible.cfg`. However, you can override these defaults using CLI options/flags if you want to.
 
diff --git a/site.yml b/site.yml
index 13c0351b23936a69ce49615b9c509cd6a11eb839..28622caa6cd28063fe2be265de40570a1271c76a 100644
--- a/site.yml
+++ b/site.yml
@@ -1,8 +1,6 @@
 ---
 - hosts: localhost
   connection: local
-  vars:
-    - ISO: "RHEL79"
   vars_prompt:
     - name: install_hostname
       prompt: "What's the hostname of the system that you're trying to install? Use ONLY the hostname, NOT the FQDN!"
diff --git a/tasks/main.yml b/tasks/main.yml
index d077a9522375b81ed87dee218d612cbe94b272df..35aa554b2039c5fab686e809b9f8929855d1b03f 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,17 +1,23 @@
 ---
 ### PREPARATION
+# Create a separate build directory so the role directory is not overly polluted
 - name: create build directory
   file:
     path: "{{ playbook_dir }}/build/"
     state: directory
+# Mount the RHEL ISO image to a temporary mountpoint. That mountpoint is
+# automatically removed on unmount.
+# To not pollute the system's fstab file, we use a separate on below /tmp/.
 - name: mount boot ISO
   mount:
     fstype: "iso9660"
     opts: "loop"
     path: "{{ playbook_dir }}/iso/"
-    src: "{{ playbook_dir }}/rhel-server-7.9-x86_64-dvd.iso"
+    src: "{{ playbook_dir }}/rhel-server-{{ rhel_version_long }}-x86_64-dvd.iso"
     fstab: "/tmp/fstab"
     state: mounted
+# Copy contents of ISO image to the build directory, because they will need to
+# be included in the new image.
 - name: copy ISO contents
   shell:
     cmd: 'cp -avRf "{{ playbook_dir }}/iso" "{{ playbook_dir }}/build"'
@@ -31,11 +37,17 @@
 
 
 ### CREATE CONFIGS
+# Write Kickstart files for all servers listed in the network.yml vars file.
+# The Kickstart file contains configurations for the RHEL Anaconda installer
+# that determine what the future system will look like in terms of packages,
+# partitioning, network configuration etc.
 - name: write Kickstart files
   template:
     src: "kickstart.cfg.j2"
     dest: "build/iso/{{ item.hostname }}.cfg"
   loop: "{{ hosts }}"
+# Write isolinux config file that contains references to the installation media
+# and the Kickstart file.
 - name: template isolinux config
   template:
     src: "isolinux.cfg.j2"
@@ -45,6 +57,8 @@
 
 
 ### CREATE ISO INSTALLATION IMAGE
+# Create the custom ISO installation DVD image. When it's finished, it can be
+# found below "./build/".
 - name: create ISO image
   command:
     cmd: 'xorrisofs -output {{ playbook_dir }}/build/{{ ISO }}.iso -eltorito-boot isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -volid "{{ ISO }}" -rational-rock {{ playbook_dir }}/build/iso/'
@@ -58,7 +72,7 @@
   mount:
     path: "{{ playbook_dir }}/iso"
     state: unmounted
-- name: clean up
+- name: clean up temporary files and directories
   file:
     path: "{{ item }}"
     state: absent
diff --git a/templates/isolinux.cfg.j2 b/templates/isolinux.cfg.j2
index fdbd2902fcb5c0909f6a2816a70cbe4f07f27abd..e8160d39a28d8af6055971b07654cfdd9470e024 100644
--- a/templates/isolinux.cfg.j2
+++ b/templates/isolinux.cfg.j2
@@ -60,7 +60,7 @@ menu separator # insert an empty line
 
 ##### Begin INSERTED FOR ANSIBLE ROLE #####
 label netinstall
-  menu label Install Red Hat Enterprise Linux 7.9 ^Netinstall Server
+  menu label Install Red Hat Enterprise Linux {{ rhel_version_long }} ^Netinstall Server
   menu default
   kernel vmlinuz
   append initrd=initrd.img inst.ks=cdrom:/{{ item.hostname }}.cfg inst.stage2=hd:LABEL=RHEL79 quiet
diff --git a/vars/main.yml b/vars/main.yml
index 37268a3460e498724df380291c3c9e3aef66d256..11e68d8aa81095f8698dbd29c900397e6dbfe439 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -1,2 +1,6 @@
 ---
 # vars file for ansible_lza_create_rhel_iso
+
+rhel_version_long: "7.9"
+rhel_version_short: "79"
+ISO: "RHEL{{ rhel_version_short }}"