diff --git a/setup/system.sh b/setup/system.sh
index d0c80619..549db583 100755
--- a/setup/system.sh
+++ b/setup/system.sh
@@ -17,6 +17,7 @@ hide_output apt-get -y upgrade
 #	         when generating random numbers for private keys (e.g. during
 #	         ldns-keygen).
 # * unattended-upgrades: Apt tool to install security updates automatically.
+# * cron: Runs background processes periodically.
 # * ntp: keeps the system time correct
 # * fail2ban: scans log files for repeated failed login attempts and blocks the remote IP at the firewall
 # * sudo: allows privileged users to execute commands as root without being root
@@ -25,7 +26,7 @@ hide_output apt-get -y upgrade
 
 apt_install python3 python3-dev python3-pip \
 	wget curl sudo coreutils bc \
-	haveged unattended-upgrades ntp fail2ban
+	haveged unattended-upgrades cron ntp fail2ban
 
 # Allow apt to install system updates automatically every day.