Update README.md

Author: larcorba

README.md

@@ -6,6 +6,8 @@
 
 #3 Zabbix 6 removed the auditlog_details table. The script is compatible with this version now, make sure to uncomment the fix for older Zabbix versions.
 
+#4 For RHEL9 based systems use the CRB repository (Rocky Linux 9 specific) to get Perl-DataTime. sudo dnf config-manager --set-enabled crb
+
 Make sure to uncomment the correct lines (see blog post), the default is setup for MySQL 5.6 or MariaDB.
 
 Also, see common issues at the bottom of the blog post.