diff --git a/README.md b/README.md
index 913ab6f..3be7ecb 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ Commit _types_ besides `fix` and `feat` are:
 
 The following _scopes_ are known for this project. A Conventional Commits commit message may optionally use one of the following scopes or none:
 
+* `iso`: Changing Arch Linux ISO CD
 * `zbm`: Adjusting ZFSBootMenu's behavior
 * `zfs`: A change to how ZFS interacts with the system, either a pool or a dataset
 * `os`: Getting an perating system set up to correctly work in a ZFS boot environment
diff --git a/setup.sh b/setup.sh
index a4ffd20..b70839c 100644
--- a/setup.sh
+++ b/setup.sh
@@ -17,6 +17,10 @@ function we_are_changerooted () {
     fi
 }
 
+function update_pacman_db () {
+    pacman -Sy
+}
+
 function install_pkgs () {
     printf -- '%s\n' 'Installing packages ...'
     pacman -S --needed --noconfirm "${@}"
@@ -471,6 +475,7 @@ function main () {
         install_os_in_chroot
     else
         set_ntp
+        update_pacman_db
         install_pkgs 'jq'
         declare zfs_part
         zfs_part="$(get_parts 'zfs')"